Yeah, the internal GPS signal can be a bit squirrely at times. It'll hold the signal for tens of minutes at a time and then it'll disappear. You'll note though that the DTG to APOMA is pretty close. Quite often I'll get a signal that will update the position about every 30 seconds or so and portray the DTG within a couple of mile but it won't be good enough to give ground speed, ETAs, etc.
We've been prohibited from using Bluetooth so the GNS5870 (I think that's the number) has been relegated but the Bad Elf should arrive soon and so I'm hopeful it'll solve the problem.
