Answers: Navigation, position from the depth

 
 

 

2)

46° 25.25'N 006° 12.82'W

Because the depth calculation is already known it is easy to position the vessel each time it crosses a contour line. This is what normally happens as you approach a harbour.

Because the distance off the shore is hard to estimate by eye at night this can be a very useful source of information.

 

 
 

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