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 567006

Two legs from a 0740 fix: where is the 0855 DR?

At 0740 you fix your position 123°T, 2.1 nm from Westfield church spire. You steer 003°T at 5.5 kn until 0815, then 142°T at 4.0 kn until 0855.

Give the 0855 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
0740 fix	123°T, 2.1 nm from Westfield church spire
Leg 1	003°T, 5.5 kn, 0740 to 0815
Leg 2	142°T, 4.0 kn, 0815 to 0855

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