7 ms·

GPS isn’t the only navigation tool. INS is pretty accurate if you zero it correctly, and VOR is good enough to keep to a specific airway.

• glitchc 3y ago
  All INSes require periodic GPS updates to limit the growth of positional error. Usually it's once per second or once every 10th of a second.
  • numpad0 3y ago
    That sounds way too frequent, isn't typical holdover like 12 hours?