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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 1600
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 3 · Dead reckoningProblem 8008

Two legs from a 1600 fix: where is the 1645 DR?

At 1600 you fix your position 217°T, 1.5 nm from Tern Island tower. You steer 220°T at 7.9 kn until 1615, then 265°T at 8.5 kn until 1645.

Give the 1645 DR position as the true bearing FROM Heron Point Light to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

Tolerance: 2° and 0.15 nm (or 4 % of the distance).

Given
1600 fix217°T, 1.5 nm from Tern Island tower
Leg 1220°T, 7.9 kn, 1600 to 1615
Leg 2265°T, 8.5 kn, 1615 to 1645
°T
nm
New problem

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