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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 9004

Gannet Rock daybeacon at 40° and then 80° on the port bow: how far off?

Steering 139°T at 9.8 kn, at 1750 you see Gannet Rock daybeacon 40° on the port bow. At 1805 it is 80° on the port bow.

How far off the object are you at 1805? 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 speed139°T, 9.8 kn
First bearing40° on the port bow at 1750
Second bearing80° on the port bow at 1805
nm
nm
New problem

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