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 579001

Two legs from a 0810 fix: where is the 0850 DR?

At 0810 you fix your position 265°T, 2.8 nm from Tern Island tower. You steer 311°T at 4.3 kn until 0840, then 024°T at 4.5 kn until 0850.

Give the 0850 DR position as the true bearing FROM Westfield church spire 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
0810 fix	265°T, 2.8 nm from Tern Island tower
Leg 1	311°T, 4.3 kn, 0810 to 0840
Leg 2	024°T, 4.5 kn, 0840 to 0850

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