Ive been putting this idea together as well..those GPS
modules are quite small & inexpensive..
I have put aside the idea of tapping the 436 for the power
too many chances foul the radio..
However,,,,
Small Lithium batts?,,,would supply the forward voltage for testing...
without any mods to the working side of the 436...
Also..
Testing to see if an internal GPS would add any RFI/EMI..
Anything added would have to keep EMC..or you could
wipe out sensitivity .. on certain bands.
(better to do with a temp power solution vs soldering
Then finding out its not viable)
Ill be watching this page with interest, Im going to order a GPS
Module when I finish posting here..
Keep us up to date..Im sure many are interested in this mod!...
I know I am...