There is already a file that is post getting off the water.
For some reason it wrote over the file.
The exact series of things that I did are...
Get off the water and pack up,
Turn off GPS and place in pocket for upload when I get home.

start talking to ANT
Turn on GPS to show large display
Turn off GPS and go home
Get home and remove Card and place in reader,
Find the only file
Hence it's all Ants fault, and not something I did.




but I'll try that when I get home Dave