Worksheet 96 · Skill 3

Dead reckoning

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1. At 1240 you fix your position 086°T, 1.7 nm from Tern Island tower. You steer 215°T at 5.3 kn until 1255, then 152°T at 6.3 kn until 1305.

   Give the 1305 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 0815 you fix your position 235°T, 1.1 nm from Gannet Rock daybeacon. You steer 309°T at 5.4 kn until 0900, then 278°T at 7.2 kn until 0910.

   Give the 0910 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 1125 you fix your position 344°T, 1.4 nm from Gannet Rock daybeacon. You steer 019°T at 5.5 kn until 1145, then 205°T at 5.4 kn until 1215.

   Give the 1215 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  

4. At 1340 you fix your position 037°T, 2.7 nm from Heron Point Light. You steer 322°T at 8.6 kn until 1355, then 166°T at 5.9 kn until 1410.

   Give the 1410 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  

5. At 0955 you fix your position 114°T, 1.7 nm from Gannet Rock daybeacon. You steer 234°T at 7.0 kn until 1015, then 071°T at 8.3 kn until 1030.

   Give the 1030 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

6. At 1155 you fix your position 014°T, 2.0 nm from Kittle water tank. You steer 063°T at 4.7 kn until 1205, then 325°T at 5.7 kn until 1220.

   Give the 1220 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 0735 you fix your position 271°T, 2.4 nm from Gannet Rock daybeacon. You steer 169°T at 5.1 kn until 0800, then 273°T at 9.7 kn until 0825.

   Give the 0825 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  

8. At 1550 you fix your position 110°T, 2.4 nm from Westfield church spire. You steer 106°T at 9.6 kn until 1610, then 184°T at 8.1 kn until 1625.

   Give the 1625 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