I'm using RunKeeper with BTStackGPS to capture my GPS track logs while jogging. In general I've gotten everything working nicely, except that my tracks are getting truncated at about 45-50 minutes. The clock keeps running but no more GPS data is collected. I thought maybe it's running out of cache for the data, since I cannot upload data until I return home to wifi. I've been blaming RunKeeper for this, since one test with SportyPal captured my entire run, no truncation. (SportyPal collects and uploads less data points)

But yesterday when RK again quit tracking after about 45 min, I looked at BTStackGPS and noticed that although data was displayed, it was static and not updating. Can't pin that on RunKeeper.

Details: I'm running BTStack on my iPod Touch 3rd gen, iOS 5.0.1, jailbroken with the latest RedSn0w. It works fine with my external bluetooth GPS puck. When I run, I start music playing and then leave RunKeeper on the screen with the system's auto-lock off. To save battery I use a little free app called ScreenDim. It blacks out the screen with just a swipe, without locking it. A one-hour workout drains less than 25% of the battery.

I should add that the bluetooth connection is maintained until I disconnect it. The loss of GPS track logging does NOT coincide with losing a connection to the GPS puck, which would do an auto-power-down after a few minutes if it lost the BT connection. This does NOT happen - it's on throughout.

Update: Although I occasionally get lucky and record a track over an hour, most of the time BTstack freezes before that. It happens with both RunKeeper and SportyPal, probably the two leading apps for this. As I noted before, the bluetooth connection is maintained and the running app continues running, but the GPS data flow is frozen. The BTstackGPS panel shows no clock advance and is completely static.

I have to conclude this is a problem with BTStack and I'm going to go try RoqyBT4. If that works, I'll regret having wasted my money and time trying to go cheap with BTstack. If RoqtBT doesn't work, I'll really be mad!!

First track with RoqyBT4 was 54 minutes, which is longer than I could expect from BTstack. If this holds up, I'll switch and not look back.

OK, just completed a run over 75 minutes and RoqyBT4 performed flawlessly. I NEVER got a track that long with BTstack, rarely even close. So RoqyBT at 5 euros ($6.83 I think) is a bargain compared to BTstack $5.

Hi. Please try the BTstack GPS 1.7 update and let me know if that fixes your problem. 1.7. has a new and much better RFCOMM implementation.

Sorry for the delay. Last night I finally got around to trying the latest version. I recorded a 48 minute track in Runkeeper without issues. This would have been unlikely before. I can't really say the problem is solved until I get a few successful tracks over 50 minutes, but so far so good! Thanks.