CaptainCraig writes:

I am not finding anything in the Garmin manual and I know that
satellite coverage is questionable, I am just wondering how it would
affect day-to-day operations.

The entire planet is covered by GPS. However, satellite orbits are optimized
for middle latitudes, so accuracy is slightly less at extremely high
latitudes, even though it should still be plenty for most purposes of lateral
navigation. Vertical position would suffer more than horizontal position, but
vertical position is already much less reliable than horizontal position at
any latitude with GPS (the system is designed primarily for lateral
navigation).

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