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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 10007

Tern Island tower at 35° and then 70° on the starboard bow: how far off?

Steering 348°T at 11.8 kn, at 1605 you see Tern Island tower 35° on the starboard bow. At 1613 it is 70° on the starboard bow.

How far off the object are you at 1613? 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 speed348°T, 11.8 kn
First bearing35° on the starboard bow at 1605
Second bearing70° on the starboard bow at 1613
nm
nm
New problem

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