Running out of memory is from the %^&** pilot not clearing the memory
before the flight. I set it for 9 second intervals and get 24 hours or
so I think.

So make sure the logger doesn't have any courses in it,
make sure you have enough battery power for the flight (or
seperate power source), and make sure you've cleared the
memory so there is some for the flight. Surprisingly
complex, not just a "turn it on and everything
will be fine" deal.

I can't wait for eTrex or Garmin to make
one with oooodles of memory, doesn't use much battery,
uses WAAS so no calibration, and has a good interface (that
doesn't auto-declare either). Oh and does .igc real well.
And costs $200.