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 431008

Two legs from a 1435 fix: where is the 1510 DR?

At 1435 you fix your position 045°T, 2.7 nm from Westfield church spire. You steer 222°T at 5.1 kn until 1455, then 024°T at 6.7 kn until 1510.

Give the 1510 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
1435 fix	045°T, 2.7 nm from Westfield church spire
Leg 1	222°T, 5.1 kn, 1435 to 1455
Leg 2	024°T, 6.7 kn, 1455 to 1510

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