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 304001

Two legs from a 0755 fix: where is the 0830 DR?

At 0755 you fix your position 300°T, 3.2 nm from Tern Island tower. You steer 280°T at 9.1 kn until 0805, then 092°T at 5.1 kn until 0830.

Give the 0830 DR position as the true bearing FROM Tern Island tower 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
0755 fix	300°T, 3.2 nm from Tern Island tower
Leg 1	280°T, 9.1 kn, 0755 to 0805
Leg 2	092°T, 5.1 kn, 0805 to 0830

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