I agree with ya Jordan,
I'm mostly using the gps at work so I have birds waiting on for hours at a time so I need to conserve battery power. That's why I run Eco.

Just did a test in HD mode and I got the same crazy results. I will just give you the high and low readings for example. (Keep in mind the bird was ringing and didnt lose any altitude).
419ft continuously decreasing to 0...down to negative -381.... then back up to +50....107....down to negative -484...+50....negative -251...+50...-282....+348....-100..then 50ft ending on the lure. I'm guessing the bird was between 400-600ft for most of that recoding. I was in HD mode so the data stream was continuous between the values I posted.

I'm pretty convinced there is an issue with either the ipad, the transmitter or the pl. The only thing that has changed is the transmitter. I got it back in November as a replacement to one I had lost. It had been working fine up until a week ago.
Ryan S