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Old May 20th 19, 11:11 PM posted to rec.aviation.soaring
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Default Implausible Time Records

If you're turning on the logger immediately before takeoff, you're risking losing
the early part of the flight entirely, not just having time problems.


Good point. I’m not usually worried about the igc file much for casual flights which is what these all were. Or at least I wasn’t worried until the OLC problem.
Of course for record, badge, or contest flights; I turn the computer and backup loggers on long before takeoff since tasks have to be entered and checked.
You may be on the right track with the 2D vs 3D lock. I will try to look at the gps satellite status page before takeoff in the future.