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 773004

Two legs from a 1510 fix: where is the 1615 DR?

At 1510 you fix your position 003°T, 2.0 nm from Westfield church spire. You steer 142°T at 4.7 kn until 1545, then 081°T at 5.5 kn until 1615.

Give the 1615 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
1510 fix	003°T, 2.0 nm from Westfield church spire
Leg 1	142°T, 4.7 kn, 1510 to 1545
Leg 2	081°T, 5.5 kn, 1545 to 1615

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