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Plot Log
Practice Sheet No. 1, Heron Sound (invented, not for navigation) 34 41 22 38 29 18 27 44 12 21 19 N VAR 7°W (invented) Heron Sound Heron Point Tern Island Westfield Kittle Gannet Rock Fl W 4s 52ft 14M TR TANK SPIRE STACK Dbn 1 2 3 HS 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Border scale: nautical miles (1 nm = 10 ticks) PRACTICE SHEET No. 1 · HERON SOUNDInvented for practice · NOT FOR NAVIGATION · Plotroom
Dividers: drag from one point to another on the chart

Start a drag on a charted object or buoy and it snaps to it. The readout gives the true bearing (and magnetic, 7°W) from where you start to where you are, and the distance in nautical miles.

Skill 7 · Doubling the angle on the bowProblem 13005

Heron Point Light at 20° and then 40° on the starboard bow: how far off?

Steering 144°T at 11.9 kn, at 0720 you see Heron Point Light 20° on the starboard bow. At 0728 it is 40° on the starboard bow.

How far off the object are you at 0728? If you hold your course and there is no current, how far off will you pass when it is abeam?

Tolerance: 0.05 nm.

Given
Course and speed144°T, 11.9 kn
First bearing20° on the starboard bow at 0720
Second bearing40° on the starboard bow at 0728
nm
nm
New problem

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