Worksheet 278 · Skill 3

Dead reckoning

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1. At 1515 you fix your position 208°T, 2.3 nm from Tern Island tower. You steer 305°T at 4.4 kn until 1550, then 227°T at 9.5 kn until 1610.

   Give the 1610 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  

2. At 0810 you fix your position 003°T, 2.3 nm from Mill stack. You steer 339°T at 7.5 kn until 0855, then 073°T at 6.3 kn until 0925.

   Give the 0925 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 1235 you fix your position 251°T, 2.4 nm from Gannet Rock daybeacon. You steer 341°T at 6.7 kn until 1310, then 174°T at 4.2 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  

4. At 1455 you fix your position 024°T, 2.5 nm from Kittle water tank. You steer 333°T at 5.5 kn until 1505, then 023°T at 9.6 kn until 1525.

   Give the 1525 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 1530 you fix your position 043°T, 2.9 nm from Tern Island tower. You steer 186°T at 5.1 kn until 1605, then 241°T at 6.8 kn until 1650.

   Give the 1650 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 0715 you fix your position 038°T, 2.1 nm from Gannet Rock daybeacon. You steer 163°T at 9.0 kn until 0735, then 239°T at 8.9 kn until 0750.

   Give the 0750 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  

7. At 1330 you fix your position 076°T, 4.2 nm from Tern Island tower. You steer 223°T at 8.2 kn until 1410, then 330°T at 4.7 kn until 1425.

   Give the 1425 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 1355 you fix your position 320°T, 1.2 nm from Kittle water tank. You steer 254°T at 6.1 kn until 1420, then 017°T at 6.6 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