Worksheet 101 · Skill 3

Dead reckoning

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1. At 1155 you fix your position 108°T, 1.2 nm from Westfield church spire. You steer 025°T at 5.2 kn until 1240, then 264°T at 5.2 kn until 1255.

   Give the 1255 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  

2. At 1435 you fix your position 291°T, 2.3 nm from Tern Island tower. You steer 171°T at 7.7 kn until 1455, then 223°T at 7.1 kn until 1520.

   Give the 1520 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  

3. At 1325 you fix your position 203°T, 1.8 nm from Gannet Rock daybeacon. You steer 292°T at 9.9 kn until 1345, then 020°T at 4.2 kn until 1400.

   Give the 1400 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 1110 you fix your position 009°T, 2.0 nm from Gannet Rock daybeacon. You steer 090°T at 7.9 kn until 1125, then 317°T at 8.0 kn until 1145.

   Give the 1145 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 0730 you fix your position 101°T, 2.4 nm from Westfield church spire. You steer 142°T at 5.9 kn until 0740, then 001°T at 4.0 kn until 0820.

   Give the 0820 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 1050 you fix your position 112°T, 1.9 nm from Gannet Rock daybeacon. You steer 254°T at 4.9 kn until 1100, then 032°T at 9.2 kn until 1110.

   Give the 1110 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  

7. At 1255 you fix your position 270°T, 2.1 nm from Gannet Rock daybeacon. You steer 288°T at 8.2 kn until 1325, then 115°T at 5.9 kn until 1405.

   Give the 1405 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 1015 you fix your position 042°T, 3.4 nm from Gannet Rock daybeacon. You steer 187°T at 4.6 kn until 1045, then 154°T at 5.3 kn until 1100.

   Give the 1100 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