Basic rule of seamanship...
While all of this talk of GPS accuracy and anomalies is fascinating we must all remember one thing:
Regardless of GPS, RADAR, compass, depthfinders or the like a captain, at all times, must maintain a proper lookout. Maintaining a proper lookout is one of the most basic rules of seamanship that everyone must master and understand before taking the helm.
Failure of an installed navigational aid, or the inability to interperet such aid accurately is never an excuse for not maintaining a proper lookout, or operating your craft at an appropriate speed with regards to surrounding water & atmospheric conditions!
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