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 779007

Two legs from a 0800 fix: where is the 0855 DR?

At 0800 you fix your position 045°T, 4.1 nm from Westfield church spire. You steer 248°T at 6.0 kn until 0830, then 105°T at 4.7 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
0800 fix	045°T, 4.1 nm from Westfield church spire
Leg 1	248°T, 6.0 kn, 0800 to 0830
Leg 2	105°T, 4.7 kn, 0830 to 0855

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