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The commercial gps is probably way easier to use than the on-board. Also a handy backup and probably more accurate than a gyro based navigation system which may drift.
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Someone I know was recently explaining how Garmin have devices for air. Because of the number of safety processes they need to go through their technology can be behind current consumer level stuff.
Something along the lines of, (passenger) aircraft need so many certificates to pass that the technology is rarely updated like in a car.
Can’t cite any actual evidence for this, but I wouldn’t be surprised if someone used a consumer item successfully as a failsafe.
user69121
pdlouche
@atz
I can’t find it at the moment but there was a photo on twitter of an SU25 pilot using a Garmin eTrex in the cockpit for navigation. Pretty amazing if that’s a normal thing; their own mapping so bad they use commercial devices instead.
Edit - it’s from Syria apparently. Even so, quite strange