Worksheet 455 · Skill 3

Dead reckoning

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1. At 1325 you fix your position 077°T, 2.3 nm from Tern Island tower. You steer 289°T at 7.8 kn until 1335, then 023°T at 6.8 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  

2. At 0750 you fix your position 349°T, 1.8 nm from Mill stack. You steer 320°T at 5.1 kn until 0800, then 086°T at 8.1 kn until 0810.

   Give the 0810 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  

3. At 1205 you fix your position 040°T, 3.8 nm from Westfield church spire. You steer 254°T at 5.9 kn until 1230, then 066°T at 6.3 kn until 1255.

   Give the 1255 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  

4. At 1335 you fix your position 216°T, 1.9 nm from Gannet Rock daybeacon. You steer 102°T at 5.3 kn until 1350, then 285°T at 8.6 kn until 1405.

   Give the 1405 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  

5. At 1155 you fix your position 056°T, 2.9 nm from Westfield church spire. You steer 030°T at 5.8 kn until 1210, then 108°T at 8.3 kn until 1230.

   Give the 1230 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  

6. At 0740 you fix your position 356°T, 1.3 nm from Heron Point Light. You steer 093°T at 8.7 kn until 0825, then 321°T at 8.6 kn until 0835.

   Give the 0835 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  

7. At 0810 you fix your position 069°T, 2.7 nm from Heron Point Light. You steer 034°T at 7.0 kn until 0835, then 262°T at 9.0 kn until 0900.

   Give the 0900 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 0835 you fix your position 022°T, 1.5 nm from Tern Island tower. You steer 098°T at 9.0 kn until 0900, then 194°T at 7.7 kn until 0915.

   Give the 0915 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