On another note with flarmnet, when you register you need
to enter either your Flarm ID number OR your Hexadecimal
from your aircraft.

If you have a transponder you need to enter the Hexadecimal.

For those with out transponder which do you enter?

I think if you have no transponder you need to enter the Flarm
ID instead of the Hexadecimal, but I have heard arguments for both
sides and it appears a lot of pilots are unsure, would be nice if we all
had this info entered correctly it is nice to see the glider ID of
whoever is showing up on your Flarm screen.