[CodeToad]

funny thing, the sextant is being taught once again.

The backup is another GPS unit. The military considered GPS so “reliable” that they have backup GPS units as the backup.

Even for aircraft nav GPS is becoming the primary navaid, with another GPS unit as backup. There are still VOR, NDB and other navaids routinely used, but GPS is becoming dominant.

[PapaBear3625]

The backup is another GPS unit. The military considered GPS so “reliable” that they have backup GPS units as the backup. Even for aircraft nav GPS is becoming the primary navaid, with another GPS unit as backup. There are still VOR, NDB and other navaids routinely used, but GPS is becoming dominant.

And if the Chinese or Russians blow away the GPS satellites? Or if an overhead aircraft jams reception of GPS signals?

[phormer phrog phlyer]

Functioning NDB’s are hard to find. The Feds are eventually doing away with terrestrial nav aids.