Sounding contours in unshaded water areas are at what interval?

At 0242 your position is LAT 41°16.8'N, LONG 71°39.9'W. You are turning for 9.3...

At 0817 your GPS indicates a position of LAT 37°01.6'N, LONG 75°31.7'W. You are...

At 0829 your position is LAT 41°02.9'N, LONG 72°57.4'W. You are making turns for...

At 1016 your position is LAT 41°07.6'N, LONG 71°38.5'W. At 1116 your position is...

At 1018 your position is LAT 41°14.4'N, LONG 72°07.2'W. At 1036 your vessels pos...

At 1020 your position is LAT 41°11.0'N, LONG 71°50.0'W. You are on course 056° p...

At 1035 your GPS position of LAT 41°05.3'N, LONG 72°33.7'W. At 1103 your positio...

At 1256 your GPS position is LAT 36°57.0'N, LONG 75°41.0'W. At 1336 your positio...

Your 1426 position is LAT 37°10.9'N, LONG 75°29.6'W. You are turning for 9.3 kno...

At 1614 your GPS position is LAT 37°01.6'N, LONG 75°31.7'W. At 1703 your positio...