Database Users

Magnets in athena

I'm thinking of deconverging myself to two devices. I currently use my htc herald as my daily driver. I need to read a lot thesedays, so, small screen is not going nice for me. I'll be using athena as a standalone, non-connected device. I also have nuts on the newly released ipaq 210. Since, athena has 8GB HDD, it would be great to store my PDFs and movies.
The only thing that bugs me about athena is its magnet thing. I've head that it can destroy/format HDDs of laptops; discharge the parking cards(magnetic ones) etc. Is there anyway to stop this?
Also, putting it in its factory case removes the magnetic effect?

no the factory case is not also magnetised, without the phone being in it

the keyboard is the only magnetic part...
if dont use the keyboard you have nothing to worry about

boinger66 said:
the keyboard is the only magnetic part...
if dont use the keyboard you have nothing to worry about
Click to expand...
Click to collapse
So, the main unit does not have magnets..right?

No,that's not correct.The main unit does have magnet. It's even labelled on the bottom of the unit itself.
However, I've never found it to be an issue.

eaglesteve said:
No,that's not correct.The main unit does have magnet. It's even labelled on the bottom of the unit itself.
However, I've never found it to be an issue.
Click to expand...
Click to collapse
so the reports making the parking lot cards and formatting the HDDs are fake? hmm.. athena here i come

kdskamal said:
so the reports making the parking lot cards and formatting the HDDs are fake? hmm.. athena here i come
Click to expand...
Click to collapse
I won't discount those report. I carry it without keyboard with a belt pouch. Therefore it never had a chance to come into contact with credit cards and parking tickets.

I've heard that the keyboard's magnet is much stronger than the magnet in the device. FWIW.

juiceppc said:
I've heard that the keyboard's magnet is much stronger than the magnet in the device. FWIW.
Click to expand...
Click to collapse
Just tested it, and I can confirm that the keyboard magnet is very much stronger than the device's.
I will test a parking ticket with just the magnet device and try to deliberately wipe out its data later and report the result later.

I too am a little concerned about the magnet but don't see myself carrying around that keyboard since it makes it bigger. Also the screen on the Advantage is so big using a on screen keyboard like PCM should be fine. No?

juiceppc said:
I too am a little concerned about the magnet but don't see myself carrying around that keyboard since it makes it bigger. Also the screen on the Advantage is so big using a on screen keyboard like PCM should be fine. No?
Click to expand...
Click to collapse
Using on-screen keyboard works better for me. As long you choose the on screen keyboard wisely, you should have enough real estate left to still see what you're doing. I stay away from the full screen keyboard of course. Very large ones like Finger Touch, the iphone skin of Resco, Tengo Thumbs Touch Pal, are all too big. I use Resco default skin and Tengo Nano.
Without the keyboard, tt's easire to slot this GPS into my device holder in the car without case and keyboard.

I did test it on a parking card and yes, the parking card now does not work. So, I took my associates employee badge (with magnetic strip), Put the keyboard on it for about a half hour...Now he needs another badge...So the keyboard must have a strong magnet. Although, I carry my athena on my side in a carrying case right next to my wallet and have never had any problems with my credit cards, etc...So ican it needs direct contact for a while, not the occasional wave over, etc....

eagle 1 said:
I did test it on a parking card and yes, the parking card now does not work. So, I took my associates employee badge (with magnetic strip), Put the keyboard on it for about a half hour...Now he needs another badge...So the keyboard must have a strong magnet. Although, I carry my athena on my side in a carrying case right next to my wallet and have never had any problems with my credit cards, etc...So ican it needs direct contact for a while, not the occasional wave over, etc....
Click to expand...
Click to collapse
Holy ****! Can you do a test on the magnets on the device?

eagle 1 said:
I did test it on a parking card and yes, the parking card now does not work. So, I took my associates employee badge (with magnetic strip), Put the keyboard on it for about a half hour...Now he needs another badge...So the keyboard must have a strong magnet. Although, I carry my athena on my side in a carrying case right next to my wallet and have never had any problems with my credit cards, etc...So ican it needs direct contact for a while, not the occasional wave over, etc....
Click to expand...
Click to collapse
OMG, what in the hell were the engineers at HTC thinking while designing athena?

kdskamal said:
OMG, what in the hell were the engineers at HTC thinking while designing athena?
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Click to collapse
I know. The lack of an earpiece and the implementation of those magnets keeps this from being the "perfect" device IMHO.

http://science.howstuffworks.com/magnet4.htm
http://www.pcworld.com/article/id,116572-page,1/article.html

kdskamal said:
OMG, what in the hell were the engineers at HTC thinking while designing athena?
Click to expand...
Click to collapse
I really don't think there is anything wrong with the Athena Magnets. I have had mine for many months, and have never accidently had any issues due to the magnets. Yes, I have used them intentionally to try and mess up parking cards, employee badges, etc. but overall, seems to work well to attach the keyboard. ANd a lot of pouches and cases have used magnets for years.

Destroying card info. yes but not strong enough to wipe out the hard drive. Just in case you are wondering there is huge magnet motor reside in your hard drive.

Rudegar said:
http://science.howstuffworks.com/magnet4.htm
http://www.pcworld.com/article/id,116572-page,1/article.html
Click to expand...
Click to collapse
May be some of the parking cards are more fragile to magnets then
But now atleast I'm less worried about the magnets
PS: the earpiece thing aint going to bother me. I'll be buying myself a SE K850i for tele communications

Just get an audio addaptor to go from the mini USB to 3,5MM socket if you want headphones wired to the device - works a treat - Mike

HTC patent for Capacitive screen stylus....

Found this interesting item on pocketnow.com Htc seem to be working on a stylus for capacitive screens. Should be interesting
http://pocketnow.com/tech-news/htc-brings-stylus-accuracy-to-capacitive-touchscreen-in-new-patent

old news.....

Question is if some support must not be built in the device. There is no public working prototype, and no one said it could work with existing displays. So don't hope too much ..

Old news alright, I was hoping this device would ship with the stylus, now hoping its available to purchase separately at some stage (SCUMMVM benefits from this, as do a few other things, not needed at all for usual use of the handset).

NZtechfreak said:
Old news alright, I was hoping this device would ship with the stylus, now hoping its available to purchase separately at some stage (SCUMMVM benefits from this, as do a few other things, not needed at all for usual use of the handset).
Click to expand...
Click to collapse
where are you planning to stick the stylus in?
There is no hole in the HD2 so it's useless..

Xeon said:
where are you planning to stick the stylus in?
There is no hole in the HD2 so it's useless..
Click to expand...
Click to collapse
ah ok, if your phone doesnt have a hole for the stylus, your keyring, pens, wallet and similar, you can't carry one with you.

I've been waiting for it ever since i first read about it..
come on..

You can already get a stylus for a capacitive screen, the HTC one might be nicer - who knows. Some have inbuilt pens etc.

The HTC one is much nicer, it looks like an ordinary stylus with a pointy tip. The existing ones have big fat heads, which kinda defeats the purpose of having a stylus in the first place...

NZtechfreak said:
defeats the purpose of having a stylus in the first place...
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Click to collapse
absolutely!!!!!!!! what's the point? :S gimme the pointy ones

NZtechfreak said:
The HTC one is much nicer, it looks like an ordinary stylus with a pointy tip. The existing ones have big fat heads, which kinda defeats the purpose of having a stylus in the first place...
Click to expand...
Click to collapse
I agree, I like the HTC version the best, however, until they come out you really only have two options...
1. Get over having a stylus (not realistic for some)
2. Buy the current versions and at least have a working solution until the HTC ones area available.

I'm in the camp that don't need a stylus, I'd just like to have one for the occasional use, so I'm happy to wait until HTC release theirs (or someone else comes up with a palatable alternative).

Nighthawk said:
I agree, I like the HTC version the best, however, until they come out you really only have two options...
1. Get over having a stylus (not realistic for some)
2. Buy the current versions and at least have a working solution until the HTC ones area available.
Click to expand...
Click to collapse
3. Don't buy an HD2 in the first place. It's not the law that you have to.

I ordered a Pogo stylus with a soft tip and big head only for use when I go out with gloves... I would love a pointy tip one though so that I can run through some WM app's menus a lot easier.... I suspect the little scroll bars that pop up during some app settings changes are going to be hard to do without one

*** Controversial statements warning ***
If a capacitive screen designed for finger-only use was a good idea, there would be no market for a capacitive stylus.
If the HTC stylus works well and is affordable, I have to wonder why it's not already on the market

Nighthawk said:
You can already get a stylus for a capacitive screen, the HTC one might be nicer - who knows. Some have inbuilt pens etc.
Click to expand...
Click to collapse
agreed x2! have you seen the ones on eBay? the tips are as big as your finger tip!!

mr_Ray said:
3. Don't buy an HD2 in the first place. It's not the law that you have to.
Click to expand...
Click to collapse
From a work perspective it is.

eskasi said:
I ordered a Pogo stylus with a soft tip and big head only for use when I go out with gloves...
Click to expand...
Click to collapse
Hmm, will that work? I'd assumed that a capacitive stylus works by establishing an electrical connection between the screen and your skin. If so then it won't work unless your skin is in direct contact with the stylus - so even a conductive stylus won't work if you're wearing gloves.

According to the report, the stylus will replace the electrical connection with the skin with some sort of magnet. If it was that easy...
I wonder if it would work if one were to dissect off a square centimetre of skin and glue it to the tip of one of the old fashined styluses...?

Cmon guys,
i have both HD and HD2 and i used the stylus on HD for less 5% of the time (never for writing). Now with HD2 i don`t even think to stylus.
I have over 100Kg so my hands were not very slim

Should HTC have provided a stylus with HD2?

I am finding clicking links which are quite small a bit hit and miss and the lighter the touch the easier it is to register a click Also registry tweaks on things like total commander are very difficult and I miss a stylus for things like this. I beleive a capacitive stylus should have been provided and left to the user to use or not. What do you think?

Nope - capacitive screens don't need styli. What they should have done is made all of the wm 6.5 menus finger friendly and maybe added a safari-type magnifying glass for clicking links in Opera.

While I was waiting for my phone to arrive, I had ordered a cheapo Pogo stylus "just in case". I've used it a few times when I first got the phone and started changing stuff in the registy, but got confident enough with my "finger poking" very quickly. Haven't used it in nearly 2 weeks now.

I think the HD2 is perfectly finger friendly. However, if HTC could have produced a stylus for the capacitive screen that was the same size as a normal stylus and managed to find room in the current case for a silo to hold it then I wouldn't have objected. Regardless of what the finger nazis would have you believe, you can still get more done faster with a stylus and ruling it out is as silly as ruling fingers out.

jakem said:
I think the HD2 is perfectly finger friendly. However, if HTC could have produced a stylus for the capacitive screen that was the same size as a normal stylus and managed to find room in the current case for a silo to hold it then I wouldn't have objected. Regardless of what the finger nazis would have you believe, you can still get more done faster with a stylus and ruling it out is as silly as ruling fingers out.
Click to expand...
Click to collapse
I agree. The transition from stylus to finger may be ok for people with slim fingers but my fingers are not slim, I have bloke hands so a stylus for me is essential for some operations like editing the registry.
The possibility of screwing something up with a large fingered prod after using that slider thing to navigate to the right registry key doesn't bear thinking about. That alone stopped me in my tracks mid regedit and made me go to the bay and buy a pogo.
Koreans and snake hipped ladyboys might find styluses obsolete but some actual men use these devices, some of us have been doing so since they were invented and some of us are over 40
HTC ought to have included a stylus, whether the user chose to use it or not.

compact_bijou said:
...
Koreans and snake hipped ladyboys might find styluses obsolete but some actual men use these devices, some of us have been doing so since they were invented and some of us are over 40
...
Click to expand...
Click to collapse
I am well over 40, neither Korean nor a ladyboy... but quite tall with quite big hands and not so small fingers...
And I got used to the touch screen after some practicing... after having some experience from Apple devices.
"Problem" is maybe that HD2 is really fast with everything. One has to get used to the sensibility of the screen and the sheer speed.

eyeofthetiger said:
Should HTC have provided a stylus with HD2?
Click to expand...
Click to collapse
Yes.
Next question?

Im also using pogo stylus, works great and regarding registry editing on mobile i use CeRegEditor which basically connects from PC to mobile registry and on PC you can fast and easily edit it.

compact_bijou said:
I agree. The transition from stylus to finger may be ok for people with slim fingers but my fingers are not slim, I have bloke hands so a stylus for me is essential for some operations like editing the registry.
Click to expand...
Click to collapse
Erm finger size not quite an excuse ... I've got slim fingers, true (I'm a girl), but instead I have long nails to contend with (and I mean long - they "stick out" by about half an inch) so I had to find the right angle to poke at. Agree with you that it would have been nice of them to include a stylus anyway and let the user decide.

i really need a slim stylus...i use VNC/RDP alot and with this phone it's quite impossible.

tictac0566 said:
One has to get used to the sensibility of the screen and the sheer speed.
Click to expand...
Click to collapse
I'm getting there with the sensitivity of the screen vs the insensitivity of my digit (it's only been 6 hours) but I have to say that I'm delighted to have finally found a hand held device which fast enough to work my way.

Stylus for A500?

Has anyone done testing with a stylus for the A500? If so, what were your thoughts?
I'd like something I can use to either draw quick sketches for photo ideas, or something I can use to jot a quick note here and there (of course, I'd probably need an app that supports handwriting, but those may come in time).

I purchased a Targus stylus today. Having come from the old pre-capacitive days when the stylus is hard, the new stylus' seemed a little odd but I must say the control is very good. Pin point accuracy - excellent for drawing.

Leechazoid said:
I purchased a Targus stylus today. Having come from the old pre-capacitive days when the stylus is hard, the new stylus' seemed a little odd but I must say the control is very good. Pin point accuracy - excellent for drawing.
Click to expand...
Click to collapse
+1
I also got the Targus stylus a week or so ago; and it does works well.. I saw another stylus somewhere online that is supposed to give you even finer control and allow you to actually see exactly where the stylus is touching the screen, but now I can't find where I saw it. I'm thinking about giving the new one a shot too, if I can find it again. ;-)

JackMetal said:
+1
I also got the Targus stylus a week or so ago; and it does works well.. I saw another stylus somewhere online that is supposed to give you even finer control and allow you to actually see exactly where the stylus is touching the screen, but now I can't find where I saw it. I'm thinking about giving the new one a shot too, if I can find it again. ;-)
Click to expand...
Click to collapse
I think you're referring to this one:
http://cgi.ebay.com/DAGi-Stylus-P10...?pt=US_Tablet_Accessories&hash=item41582701ff
I have one and it works very well in general. The only issue is getting it at the right angle with the screen - particularly if you have the screen at an angle. But I like it better than the rubber tipped ones.

I bought the Boxwave stylus. I like it a lot. However it doesn't always catch it, sometimes it clicks on a screen I don't want or am scrolling through. But other than that, I am very happy with it for detailed work. My fingers get sweaty on occasion and I have a hard time using the screen when they are like that. So the stylus is a nice addition to have, especially if you don't like fingerprints.
I do wonder if it will somehow mess up the screen though later on.

Just curious, is there any way to get hand writing recognition to work? So for instance, if I bought one of these stylus's, would I be able to use it and forgo the need for an on screen keyboard?

saeba said:
I think you're referring to this one:
http://cgi.ebay.com/DAGi-Stylus-P10...?pt=US_Tablet_Accessories&hash=item41582701ff
I have one and it works very well in general. The only issue is getting it at the right angle with the screen - particularly if you have the screen at an angle. But I like it better than the rubber tipped ones.
Click to expand...
Click to collapse
Thanks. Yep, that's the one; I couldn't remember it's name at all.

kb_klash said:
Just curious, is there any way to get hand writing recognition to work? So for instance, if I bought one of these stylus's, would I be able to use it and forgo the need for an on screen keyboard?
Click to expand...
Click to collapse
I'm using flexT9 app which has peninput, but its not perfect, the capacitive stylus is more like big stick then a pen

Can anyone recommend a stylus that's got more of a penpoint tip rather than something the size of a finger?

With a capacitive screen I don't think something like this exists. Although I was in a meeting today with somebody taking notes on an I pad, not sure how they were doing that.

I own this stylus and I really like it. This is the only stylus I have used so I cannot compare it to anything.
http://www.amazon.com/gp/product/B004BSF1I8

propagandax said:
With a capacitive screen I don't think something like this exists. Although I was in a meeting today with somebody taking notes on an I pad, not sure how they were doing that.
Click to expand...
Click to collapse
I got word yesterday that Acer is releasing one specifically for the A500. I will get more information and keep everyone posted.
I'm getting behind on everything as I had to go out of town for a few days on a business trip. Also, prototype custom Iconia case ships to me today for a review and should be available stateside after the 26th. It's similar to the FUSE.

I also use a Targus stylus for iPad as it was called.
Has a soft rubber tip, but works great on my device.

I have a griffin made for the Ipad but works on all my Android touch screens

drawing
This looks like a great one. I also found a video on you tube how to make one out of a pin and allum Fool
Going to try the DIY thing as it looks super accurate. If fails I'll be buying this one
http://cgi.ebay.com/oStylus-Capacit...?pt=US_Tablet_Accessories&hash=item4aab617685

propagandax said:
With a capacitive screen I don't think something like this exists. Although I was in a meeting today with somebody taking notes on an I pad, not sure how they were doing that.
Click to expand...
Click to collapse
Youtube dagi stylus and you will see magic

my gf works at best buy and she got me the Rocketfish (best buy brand) stylus for 2 bucks lol. it works great with the iconia and ipads.

stylus
I picked up the targus stylus from staples.its kinda OK.
But I do enjoy my hair stylists She rocks.geeky girls can look hot as well.giggles

Has anyone found an app that allows taking handwritten notes? Everything I have tested is really laggy for note taking.

huxflux2003 said:
Has anyone found an app that allows taking handwritten notes? Everything I have tested is really laggy for note taking.
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Click to collapse
Nah - all I've found are really crappy too.

Little quirk of the s-pen

I've noticed something interesting with the s-pen. Having used a lot of phones that had a stylus, i am using the s-pen a lot. If I'm using the phone in bed and I'm lying down with the phone held above me, when using the s-pen, the phone will respond to the pen even if it's held up to a centimetre above the screen without actually making contact.
Anyone else noticed this? Still loving the phone though. It's clearly the best device i have ever had.
Sent from my GT-N7000 using xda premium

Mine doesn't do that. In fact, I can very lightly touch the screen with the stylus without it registering. I have to give it a little pressure. This is in any position. I saw a YouTube video of someone having the same effect you describe, though; I wonder if it's a stylus thing or a screen thing.

maxh said:
Mine doesn't do that. In fact, I can very lightly touch the screen with the stylus without it registering. I have to give it a little pressure. This is in any position. I saw a YouTube video of someone having the same effect you describe, though; I wonder if it's a stylus thing or a screen thing.
Click to expand...
Click to collapse
Same as you. I honestly wish it was a tiny bit more sensitive to be honest.
Sent from my GT-N7000 using xda premium

spfraggle said:
I've noticed something interesting with the s-pen. Having used a lot of phones that had a stylus, i am using the s-pen a lot. If I'm using the phone in bed and I'm lying down with the phone held above me, when using the s-pen, the phone will respond to the pen even if it's held up to a centimetre above the screen without actually making contact.
Anyone else noticed this? Still loving the phone though. It's clearly the best device i have ever had.
Sent from my GT-N7000 using xda premium
Click to expand...
Click to collapse
It's supposed to know the pen is there before it touches the screen so it can turn off the touch screen. That way your palm does not activate it.

spfraggle said:
I've noticed something interesting with the s-pen. Having used a lot of phones that had a stylus, i am using the s-pen a lot. If I'm using the phone in bed and I'm lying down with the phone held above me, when using the s-pen, the phone will respond to the pen even if it's held up to a centimetre above the screen without actually making contact.
Anyone else noticed this? Still loving the phone though. It's clearly the best device i have ever had.
Sent from my GT-N7000 using xda premium
Click to expand...
Click to collapse
I've experienced that, quite a few times (makes it frustrating to play "Crayon physics"!).

spfraggle said:
I've noticed something interesting with the s-pen. Having used a lot of phones that had a stylus, i am using the s-pen a lot. If I'm using the phone in bed and I'm lying down with the phone held above me, when using the s-pen, the phone will respond to the pen even if it's held up to a centimetre above the screen without actually making contact.
Anyone else noticed this? Still loving the phone though. It's clearly the best device i have ever had.
Sent from my GT-N7000 using xda premium
Click to expand...
Click to collapse
The reason it is probably doing that is because of how Wacom technology is designed. To register interaction with the screen, the tip on the stylus is pressed down to make contact with the sensor inside the stylus. It then communicates with the radio inside the screen. So obviously if the stylus is held upside down, the tip will be making constant contact with the sensor. It could be that the stylus tip is slightly loose, so you should try another Wacom stylus.

cadavar said:
The reason it is probably doing that is because of how Wacom technology is designed. To register interaction with the screen, the tip on the stylus is pressed down to make contact with the sensor inside the stylus. It then communicates with the radio inside the screen. So obviously if the stylus is held upside down, the tip will be making constant contact with the sensor. It could be that the stylus tip is slightly loose, so you should try another Wacom stylus.
Click to expand...
Click to collapse
I just confirmed this on mine. I used a piece of tape to hold the tip of my stylus depressed, and that caused me to experience the issue. Looks like some people have defective stylii.

Heard about it before
http://www.youtube.com/watch?v=9VfkXo0KU5c&sns=em

Also, if you change the angle of using the pen, the ink start from higher (not from under the pen)!

zsolti256 said:
Also, if you change the angle of using the pen, the ink start from higher (not from under the pen)!
Click to expand...
Click to collapse
I would venture a guess that this problem is the underlying issue with the minority of people who complain that the stylus is inaccurate. I wonder if it would be possible for Samsung or someone here to create a calibration function so as to adapt to how the user typically holds the stylus.
Or we could go this route...
<apple>You're holding it wrong!</apple>

I think the offset of the pen is actually purposely added to look more natural in most use-cases, but occasionally manifests itself strangely, like at strange angles. Here's the easiest way to reproduce the weirdness -
Turn off auto-rotation.
In normal portrait orientation, bring up the S-memo quick note double tap thing.
Write your name (or whatever) along the bottom of the quick note, holding the pen as you typically would. Notice how the strokes are drawn.
Without closing that note, hold the phone upside-down.
Now write the same thing you wrote before, along what is now the bottom of the note. Notice how the strokes are now drawn.
The strokes are offset in the direction that you tilt the pen (non-inverted control scheme ), but is also offset very slightly higher up the screen that the pen by default. This is so as to look more natural in normal use, because of course the pen does not actually touch the area that it is drawing on; the glass is in the way. The effect stacks somewhat strangely, however, when holding it, for example, upside-down.

theimaginaryage said:
I think the offset of the pen is actually purposely added to look more natural in most use-cases, but occasionally manifests itself strangely, like at strange angles. Here's the easiest way to reproduce the weirdness -
Turn off auto-rotation.
In normal portrait orientation, bring up the S-memo quick note double tap thing.
Write your name (or whatever) along the bottom of the quick note, holding the pen as you typically would. Notice how the strokes are drawn.
Without closing that note, hold the phone upside-down.
Now write the same thing you wrote before, along what is now the bottom of the note. Notice how the strokes are now drawn.
The strokes are offset in the direction that you tilt the pen (non-inverted control scheme ), but is also offset very slightly higher up the screen that the pen by default. This is so as to look more natural in normal use, because of course the pen does not actually touch the area that it is drawing on; the glass is in the way. The effect stacks somewhat strangely, however, when holding it, for example, upside-down.
Click to expand...
Click to collapse
i think i am a lucky one, i dont have this werdness at all it works the same exactly both ways.. knowing im on middle east ROM.

hazem77 said:
i think i am a lucky one, i dont have this werdness at all it works the same exactly both ways.. knowing im on middle east ROM.
Click to expand...
Click to collapse
Interesting! I assumed people were seeing differences just because they were using the phone in different ways, but if you still can't see it by doing this, I guess there actually is a fundamental difference in different phones.
Was there a calibration thing when we first set up the phone? I don't remember anymore. BTW, I'm on KJ4.

No, no calibration thing at the beginning. Still hoping for one.

One thing i thought i should be clear on. The stylus works perfectly fine in all other situations and it's only if the device is angled in that way the stylus behaves accordingly. Personally, it's not a problem for me. I still see this as the best device i have ever owned.
Sent from my GT-N7000 using xda premium

AnandA777 said:
Or we could go this route...
<apple>You're holding it wrong!</apple>
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Click to collapse
Very Clever

I still think that if the galaxy note displayed a little dot while hovering with the pen, it would be much better. With all wacom devices on windows, with a tablet or a wacom layer above a screen, the dot lets you see exactly where the next stroke will begin.
When you use a wacom pen, you don't start your next stroke based on the location of the actual pen on the screen.
Even with perfect calibration you still have the parallax effect looking through a thick glass layer. Looking even at a slightly different angle will cause the pen to be off again.
Instead, you use the dot.
Hopefully someone will be able to develop something to put a dot or a cursor of some sort on the screen.