Worksheet 72 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 076°T, 3.3 nm from Tern Island tower. You steer 299°T at 6.1 kn until 1240, then 056°T at 5.3 kn until 1300.

   Give the 1300 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 1110 you fix your position 198°T, 1.8 nm from Gannet Rock daybeacon. You steer 280°T at 9.2 kn until 1130, then 033°T at 6.8 kn until 1140.

   Give the 1140 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 1155 you fix your position 067°T, 3.4 nm from Tern Island tower. You steer 340°T at 7.7 kn until 1205, then 259°T at 4.7 kn until 1240.

   Give the 1240 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 1235 you fix your position 291°T, 1.9 nm from Tern Island tower. You steer 053°T at 9.3 kn until 1255, then 255°T at 9.8 kn until 1320.

   Give the 1320 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 1020 you fix your position 033°T, 2.3 nm from Tern Island tower. You steer 289°T at 6.4 kn until 1035, then 124°T at 7.3 kn until 1115.

   Give the 1115 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 1250 you fix your position 004°T, 2.3 nm from Tern Island tower. You steer 274°T at 6.3 kn until 1315, then 092°T at 8.2 kn until 1325.

   Give the 1325 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 1420 you fix your position 024°T, 2.4 nm from Tern Island tower. You steer 275°T at 9.7 kn until 1435, then 204°T at 9.1 kn until 1450.

   Give the 1450 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 1055 you fix your position 357°T, 1.4 nm from Kittle water tank. You steer 336°T at 9.8 kn until 1110, then 256°T at 7.1 kn until 1120.

   Give the 1120 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