Navigation General · GPS & GNSS
A prudent navigator treats a GPS position as:
- AInfallible and sufficient by itself
- BOnly useful offshore
- COne input to be cross-checked against other LOPs, soundings, and visual/radar fixes✓ Correct
- DA substitute for keeping a lookout
Explanation
GPS can fail, be jammed/spoofed, or be plotted on the wrong datum. Good practice cross-checks the GPS fix against soundings, ranges, bearings, and radar, and never lets electronic position-fixing displace the visual lookout and sound judgment.
Authority: Navigation practice; 33 CFR 164
Practice the full Navigation General bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Navigation General questions
- GPS & GNSS
GPS determines a receiver's position by measuring:
- GPS & GNSS
Which error source can cause a GPS position to appear displaced from its true location without any visible indication to the operator?
- GPS & GNSS
Selective Availability (SA), the intentional degradation of GPS civilian signals, was:
- GPS & GNSS
Multipath error in GPS occurs when:
- GPS & GNSS
The horizontal datum to which modern GPS positions are referenced is:
- GPS & GNSS
WAAS (and similar SBAS) improves GPS accuracy by: