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Old 01-15-2016, 12:34 PM   #11
koliver
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City: Saltspring Island
Country: BC, canada
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 3,160
Friend of mine (very experienced and conscientious navigator) hit a rock near Fox Island early this summer. I was there later and confirmed the existence of the rock. It showed on my Cmap chart plotter and on my very old CHS strip charts, but was missing from all other CHS charts and from his Nobeltec system.
Raster charts will not lose detail as the zoom changes, but vector charts will. A well publicized case in point is a recent Volvo Ocean race, Where one of the competitors, with a pro Navigator aboard and in charge, hit a well known reef in the middle of the Indian Ocean, that was only visible at a zoom level considered too close for the long distance of that leg of the trip. Had the navigator used a closer zoom or a raster chart or a paper chart, the reef would have been obvious.
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