I've been thinking about this a little more and I've got some opinion questions.

What does everyone use as a backup transmitter to their GPS units? Seems like you'd want something relative light since it would not be on the backpack but still have a longer run time to complement the GPS's relative short run time.

Is anyone planning on using GPS on birds at hack this spring? Seems like a cool applications and might give you a good ideas as to when to recover them.

Can you adjust the refresh rate of the transmitter through the software?