Worksheet 207 · Skill 3

Dead reckoning

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1. At 1315 you fix your position 331°T, 1.3 nm from Gannet Rock daybeacon. You steer 200°T at 6.8 kn until 1330, then 031°T at 5.7 kn until 1350.

   Give the 1350 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  

2. At 1455 you fix your position 130°T, 2.8 nm from Tern Island tower. You steer 143°T at 9.9 kn until 1505, then 004°T at 9.9 kn until 1520.

   Give the 1520 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  

3. At 1435 you fix your position 268°T, 1.7 nm from Tern Island tower. You steer 252°T at 7.7 kn until 1500, then 116°T at 9.5 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  

4. At 1500 you fix your position 092°T, 2.6 nm from Westfield church spire. You steer 017°T at 9.2 kn until 1510, then 163°T at 4.8 kn until 1555.

   Give the 1555 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 1355 you fix your position 303°T, 2.8 nm from Tern Island tower. You steer 103°T at 5.5 kn until 1415, then 314°T at 7.5 kn until 1430.

   Give the 1430 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 1335 you fix your position 227°T, 2.7 nm from Tern Island tower. You steer 294°T at 4.8 kn until 1345, then 213°T at 6.0 kn until 1355.

   Give the 1355 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  

7. At 0955 you fix your position 057°T, 2.6 nm from Tern Island tower. You steer 160°T at 4.1 kn until 1005, then 296°T at 9.7 kn until 1015.

   Give the 1015 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 1425 you fix your position 047°T, 2.1 nm from Gannet Rock daybeacon. You steer 244°T at 6.0 kn until 1435, then 160°T at 5.0 kn until 1510.

   Give the 1510 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