Joseph:
So I have to ask, any chance of further development of Gmap4 to fill that void?  Real time projection of Spot data to MyTopo or similar quality?  Point and click/drag and drop file conversion of GPS data ?   
I want to add a trip planning feature and as part of that I will need to add code to "parse" GPX files.  Once I have that working then I expect that parsing a SPOT file would also be doable.  I've already done a bunch of the trip planning coding but have more to do.  Also, Gmap4 development is temporarily  on hold while I pursue a map-related software project with commercial potential in the real estate field.
I've not given any thought to real time SPOT display.  Maybe  someone else will take  that on:
Get Spot data
Convert to a file format Gmap4 can read
Place file online
Launch/refresh Gmap4 and point it at the file
Pause
Repeat
Joseph