Worksheet 273 · Skill 3

Dead reckoning

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1. At 1415 you fix your position 046°T, 4.4 nm from Westfield church spire. You steer 115°T at 4.2 kn until 1445, then 182°T at 4.7 kn until 1530.

   Give the 1530 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).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

2. At 1530 you fix your position 063°T, 2.6 nm from Heron Point Light. You steer 000°T at 4.0 kn until 1600, then 272°T at 8.2 kn until 1620.

   Give the 1620 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).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

3. At 0820 you fix your position 009°T, 3.3 nm from Westfield church spire. You steer 105°T at 5.3 kn until 0905, then 053°T at 4.8 kn until 0935.

   Give the 0935 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).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

4. At 1340 you fix your position 276°T, 1.4 nm from Tern Island tower. You steer 202°T at 6.3 kn until 1425, then 048°T at 8.5 kn until 1455.

   Give the 1455 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).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

5. At 1350 you fix your position 308°T, 1.4 nm from Gannet Rock daybeacon. You steer 070°T at 7.3 kn until 1405, then 103°T at 6.0 kn until 1430.

   Give the 1430 DR position as the true bearing FROM Gannet Rock daybeacon 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).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

6. At 1050 you fix your position 353°T, 3.3 nm from Mill stack. You steer 315°T at 6.6 kn until 1120, then 096°T at 8.7 kn until 1130.

   Give the 1130 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).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

7. At 1255 you fix your position 096°T, 2.2 nm from Gannet Rock daybeacon. You steer 351°T at 5.4 kn until 1335, then 229°T at 7.1 kn until 1350.

   Give the 1350 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).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

8. At 1000 you fix your position 232°T, 2.1 nm from Gannet Rock daybeacon. You steer 022°T at 8.7 kn until 1025, then 116°T at 7.9 kn until 1040.

   Give the 1040 DR position as the true bearing FROM Gannet Rock daybeacon 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).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm