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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 24005

Tern Island tower at 20° and then 40° on the port bow: how far off?

Steering 082°T at 10.4 kn, at 1330 you see Tern Island tower 20° on the port bow. At 1345 it is 40° on the port bow.

How far off the object are you at 1345? 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 speed082°T, 10.4 kn
First bearing20° on the port bow at 1330
Second bearing40° on the port bow at 1345
nm
nm
New problem

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