GPS-Sport ForenRun.GPS HardwareInternal or External GPS??
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gmngueko 06.01.2009 16:52:45 UTC

I can go easily 3h+ on my htc TyTn II

using the internal GPS I was able to go 3hours + but I don't remember if I switched the phone module off or not. since then I bought an extended battery (2800 mAh) on which I could theoretically go 6h+ :-).
recneps 02.01.2009 15:01:15 UTC

Update - aGPS

@gary_lee;
I have recently run the system modification to enable the aGPS mode on the internal GPS of my XV6800. It greatly improved the acquisition time as well as the accuracy. Unfortunately, it is apparent that the combination of weaker GPS reception and data point frequency coming from the GPS unit are the main culprits for my tracks showing up as significantly shorter than they really are (for mountainbiking anyway).

For instance, on 12/31 I rode with some friends...I had Run.GPS on the phone's internal GPS, one guy had a Garmin Edge 305 and the last guy has an onboard distance trainer. My track was 10.92mi - the Garmin unit reported a little over 14mi and the cycle computer tallied 14.98mi. Assuming that his cycle computer is set up correctly, that means my setup is recording over 27% less distance than actual. I thought for sure that riding without the thick leafy canopy overhead would give better results for the internal GPS on my phone but it looks like I'll be switching to the Freedom external unit (for mountainbiking anyway) since you have had good results.

Thanks,
recneps


gary_lee 12.11.2008 19:40:21 UTC



Thanks. I've looked at the loggers, but the appeal to me of using GPS is real-time feedback (ie: just crossed mile X, how am I doing?), and I don't see how they give this as it would appear they are just black boxes that record and give back data.

Will keep searching for the "holy grail" of solutions.

Thanks.
recneps 12.11.2008 19:22:55 UTC



I guess my only reservation about going back to an external GPS is that I could potentially have up to three bluetooth devices connected at once (GPS, headset and HRM), and I'm not sure how the phone would handle all of that for extended periods.

I do like the Freedom unit you described. My last external GPS (a Wintec G-Rays 2) would also log data internally but since two of my phone's programs can also log (Run.GPS and GPSToday), I'm not sure how useful logging is for the external GPS other than being able to use it independently of the phone. The Wintec unit I had began its downward spiral after it went through the washing machine inside a pants pocket.

To address your 2+ hour runs, an external GPS with logging capability might help. My Wintec unit would log for over 4 hours easily by itself, with a sampling rate of 1Hz and the internal storage would be less than half full. You could send it out as GPX format and then bring it into the GPS-Sport.net profile later.
gary_lee 12.11.2008 17:56:50 UTC



2 hours on internal? Wow. I've never been able to get that performance on my Tilt. I tried turning off data yesterday while running and so the only things running on the phone were voice and Bluetooth for the external GPS. Battery performance improved, but strangely my run as tracked by Run.GPS was way, way off. I ran the same route as always and the GPS map and distance were just wrong. Plus it reported a few pauses in my run when I never did. Will track on my next run.

Yes, the Tilt can use aGPS. The free Kaiser Tweak app can turn this on or off. I have it disabled since I also use Quick GPS and the tweak explicitly warns the two combined can cause issues. I am now using the external GPS almost exclusively, but I am wondering what /how I can overcome these battery issues to support long runs. I am training for my first marathon, and know that I am going to have to squeeze some 2+ hour runs in and right now my Tilt running GPS internal or external is just not making it.

Hate to think of going with a Garmin watch.....

recneps 12.11.2008 16:55:37 UTC



gary-
My XV6800 is okay on battery drain - with a full charge, I can get 2+ hrs of Run.GPS mountainbiking on the internal GPS. But...having used an external GPS before, I don't like the inaccuracies of the internal GPS and it seems to go a little wacky about 1hr into a training (altitude especially).

Question for you - do you know if your Tilt can use aGPS as well as standalone mode, and if so how is the accuracy (when you were using the internal GPS)? My current Windows Mobile 6.1 ROM only allows for the standalone mode and I have recently found the update to enable aGPS mode as well. I'll keep you guys posted as to the results (good or bad), but I think I may go back to using an external GPS anyway.
gary_lee 06.11.2008 03:06:16 UTC

Don't recommend internal GPS on Tilt

I know you posted this months ago, but if you are still tracking this....my experience with using the internal GPS on the AT&T Tilt is pathetic. The battery drain is excessive and I am lucky if I can get 20-30 minutes from a fully-charged battery.

I've switched to an external bluetooth GPS unit - the Freedom 2000 and am very, very happy. It's early testing for me, but so far this unit exceeds the performance of the internal chipset and the battery usage is much, much improved.

On the performance side, I generally run on mountain trails, and in spots today where I know the internal GPS lost complete view of the GPS network, the Freedom had 12 GPS 'birds' in range and excellent performance.

The Freedom unit is a keychain unit - very small and easy to run with.

Highly recommend this as a solution.

Again, only a few days with both the Freedom unit and Run.GPS, but so far I think this is going to be what I am looking for in a training solution.
recneps 24.03.2008 13:48:21 UTC geändert am 24.03.2008 13:50:16 UTC



My US Verizon XV6800 (HTC TyTn, same chipset as the HTC Tilt as well) now apparently has some 'stable' ROM updates available that successfully unlock the internal GPS in the phone. I have been using an external bluetooth GPS (Wintec GRays2), and I have been happy with the performance, and also happy that it logs data internally for download and post-processing later.

Can anyone give me any significant advantages (other than the obvious convenience) of switching to the internal GPS? There are already some disadvantages to the ROM upgrade - I lose a few of the built-in programs on my device, and I am worried that since my phone is in a neoprene-lined aluminum hard case and inside my backpack during riding the signal will not be very strong. My current external GPS unit is velcro-mounted to my helmet, and although the signal is strong, I get a lot of strange looks on the trail due to the blinking red and blue lights.

Tom/Robert/other TyTn or Tilt users - any hardware suggestions here?

Thanks,
recneps
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