Worksheet 595 · Skill 3

Dead reckoning

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1. At 1430 you fix your position 192°T, 2.0 nm from Tern Island tower. You steer 254°T at 7.1 kn until 1500, then 003°T at 6.6 kn until 1535.

   Give the 1535 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 1340 you fix your position 024°T, 2.1 nm from Gannet Rock daybeacon. You steer 028°T at 5.3 kn until 1420, then 208°T at 5.7 kn until 1455.

   Give the 1455 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 1125 you fix your position 132°T, 2.9 nm from Tern Island tower. You steer 098°T at 8.5 kn until 1140, then 353°T at 8.0 kn until 1210.

   Give the 1210 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 1115 you fix your position 048°T, 2.0 nm from Gannet Rock daybeacon. You steer 111°T at 5.3 kn until 1130, then 276°T at 7.6 kn until 1205.

   Give the 1205 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 1430 you fix your position 281°T, 2.0 nm from Tern Island tower. You steer 247°T at 6.8 kn until 1510, then 008°T at 6.3 kn until 1525.

   Give the 1525 DR position as the true bearing FROM Westfield church spire 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 Westfield church spire: ________ °T   Distance: ________ nm  

6. At 1205 you fix your position 003°T, 1.2 nm from Kittle water tank. You steer 273°T at 9.9 kn until 1240, then 337°T at 5.0 kn until 1325.

   Give the 1325 DR position as the true bearing FROM Westfield church spire 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 Westfield church spire: ________ °T   Distance: ________ nm  

7. At 1405 you fix your position 035°T, 3.3 nm from Gannet Rock daybeacon. You steer 198°T at 5.9 kn until 1420, then 320°T at 7.6 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 1545 you fix your position 240°T, 3.5 nm from Tern Island tower. You steer 192°T at 7.3 kn until 1600, then 015°T at 7.0 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