Ah. Do you have a cartridge to try in the other slot with other data on?
Have you tried the other slot? (don't think you can put the "normal" one
in that slot). (programmable one?)Does it work or are both of them
up the spout?

Nah, it's an internal failure in the Airmap 300. It WILL work if you leave
the GPS in the enclosed cockpit on a hot day, and heat it to something over
100 degrees. I suppose whatever hairline crack is causing the problem
expands shut, makes the connection, and *poof* all is well....

....until the unit cools back down to ambient temperature. Then you lose the
database again. It doesn't matter which data slot you put the cartridge in.

Lowrance is aware of the problem, and refuses to support the unit, despite
it being only four years old. Which is why we chose not to purchase the
Airmap 500 or 1000.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"