Celestial Navigation For Deck Officers And For — ...

: One of its most frequent modern uses on large merchant vessels is for compass calibration and error checking when no terrestrial references are available .

While modern ships rely heavily on Global Positioning Systems (GPS) and Electronic Chart Display and Information Systems (ECDIS), celestial navigation remains a . Celestial navigation for deck officers and for ...

: It serves as a "no-batteries-required" secondary system essential for long-distance ocean passages if electronic systems fail or are jammed . : One of its most frequent modern uses