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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 26004

Heron Point Light at 25° and then 50° on the starboard bow: how far off?

Steering 121°T at 9.7 kn, at 1445 you see Heron Point Light 25° on the starboard bow. At 1450 it is 50° on the starboard bow.

How far off the object are you at 1450? 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 speed121°T, 9.7 kn
First bearing25° on the starboard bow at 1445
Second bearing50° on the starboard bow at 1450
nm
nm
New problem

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