I check the IGC files I had and found of the ones I could check the
C302 and Clearnav and my EW-model D seemed to be the only Loggers that
did not have a competion ID.

It looked like perhap only the older Cambridge, I am unsure what model
did not have a GliderID.

This doesn't meant that they can't be configured to have both, I just
didn't see them in the IGC files I looked at.

here are my results:

GLIDERID COMPETITIONID
Clearnav X
Volkslogger X X
Cambridige? X
C302 X
EW-MR X X
EW-mod D X
Flarm X X
Winpilot X X
Zander GP940 X X

Brian