Worksheet 609 · Skill 3

Dead reckoning

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1. At 1045 you fix your position 358°T, 2.8 nm from Mill stack. You steer 283°T at 6.1 kn until 1105, then 091°T at 5.9 kn until 1135.

   Give the 1135 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  

2. At 1210 you fix your position 342°T, 1.5 nm from Tern Island tower. You steer 235°T at 8.9 kn until 1225, then 340°T at 8.1 kn until 1235.

   Give the 1235 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  

3. At 1255 you fix your position 268°T, 1.3 nm from Tern Island tower. You steer 223°T at 8.1 kn until 1330, then 087°T at 9.0 kn until 1350.

   Give the 1350 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

4. At 1325 you fix your position 332°T, 2.6 nm from Kittle water tank. You steer 078°T at 4.0 kn until 1345, then 342°T at 5.8 kn until 1415.

   Give the 1415 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 1355 you fix your position 291°T, 1.5 nm from Tern Island tower. You steer 184°T at 5.7 kn until 1405, then 220°T at 7.8 kn until 1430.

   Give the 1430 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

6. At 1420 you fix your position 053°T, 1.8 nm from Gannet Rock daybeacon. You steer 272°T at 8.3 kn until 1450, then 192°T at 4.9 kn until 1500.

   Give the 1500 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 1040 you fix your position 003°T, 2.2 nm from Heron Point Light. You steer 013°T at 9.3 kn until 1110, then 169°T at 8.5 kn until 1125.

   Give the 1125 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  

8. At 1315 you fix your position 012°T, 1.2 nm from Westfield church spire. You steer 099°T at 7.1 kn until 1330, then 305°T at 4.2 kn until 1355.

   Give the 1355 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