Worksheet 532 · Skill 3

Dead reckoning

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1. At 0800 you fix your position 003°T, 2.7 nm from Mill stack. You steer 335°T at 7.5 kn until 0825, then 104°T at 8.3 kn until 0905.

   Give the 0905 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 0825 you fix your position 035°T, 2.8 nm from Tern Island tower. You steer 275°T at 7.9 kn until 0850, then 245°T at 5.5 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 1445 you fix your position 059°T, 2.8 nm from Heron Point Light. You steer 302°T at 8.3 kn until 1505, then 112°T at 5.2 kn until 1540.

   Give the 1540 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  

4. At 1045 you fix your position 286°T, 3.4 nm from Tern Island tower. You steer 166°T at 9.6 kn until 1055, then 119°T at 5.2 kn until 1130.

   Give the 1130 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 1225 you fix your position 064°T, 3.1 nm from Gannet Rock daybeacon. You steer 255°T at 8.3 kn until 1305, then 332°T at 4.1 kn until 1335.

   Give the 1335 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 0910 you fix your position 017°T, 1.6 nm from Gannet Rock daybeacon. You steer 100°T at 4.6 kn until 0925, then 194°T at 5.8 kn until 1000.

   Give the 1000 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 1340 you fix your position 076°T, 2.8 nm from Tern Island tower. You steer 171°T at 7.7 kn until 1405, then 244°T at 8.9 kn until 1425.

   Give the 1425 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  

8. At 1220 you fix your position 053°T, 1.7 nm from Heron Point Light. You steer 325°T at 7.5 kn until 1240, then 029°T at 9.7 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