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 709003

Two legs from a 0730 fix: where is the 0800 DR?

At 0730 you fix your position 022°T, 1.4 nm from Westfield church spire. You steer 049°T at 6.5 kn until 0750, then 308°T at 4.0 kn until 0800.

Give the 0800 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
0730 fix	022°T, 1.4 nm from Westfield church spire
Leg 1	049°T, 6.5 kn, 0730 to 0750
Leg 2	308°T, 4.0 kn, 0750 to 0800

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