There is also a freeware utility for Cambridge GPS-NAV flight claiming
to OLC written by Carl Ekdahl available on the ASC website:

http://www.abqsoaring.org/misc_files/CAI_fix.htm

So now, there should be no more red marks for Cambridge!

If you got a red mark yesterday (or know someone who did) please try
reclaiming the flight with one of these programs.