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In article , Jim Vincent
writes
Chip,

It just occured to me that for security reasons, the data logger has to be an
integrated unit where the GPS and logger are tied together in one package. So
switching GPS feeds would not work.

Just get a Volkslogger ( I think they're the least expensive) and a dedicated
2AH battery.

Jim Vincent

While the Volkslogger is excellent kit is most respects, it has one
drawback. It is necessary to manually erase old flights to ensure there
is room to store new flights. When the memory becomes full, it stops
recording.

For this reason, it would be better to chose the Colibri which is
similar in size but overwrites old flights as necessary (Just like your
Cambridge).

Tim Newport-Peace

"May you be cursed with a chronic anxiety about the weather."

John Burroughs (1837-1921).