Thanks Kinsell for this and prior comment.

I guess I didn't notice (or forgot) that SeeYou produces a .cai file also.

I am assuming thoug that logs from the GPS-NAV would need to be submitted in .cai format. When I look at the flight in both igc and cai format in SeeYou I get a 'Flight integrity: Unknown?'. But when I check the cai file back in Aero Explored it says it is valid.

Thanks again.