Worksheet 176 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 030°T, 2.2 nm from Heron Point Light. You steer 080°T at 10.0 kn until 1315, then 197°T at 9.7 kn until 1330.

   Give the 1330 DR position as the true bearing FROM Mill stack 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 Mill stack: ________ °T   Distance: ________ nm  

2. At 1110 you fix your position 037°T, 3.3 nm from Heron Point Light. You steer 021°T at 7.3 kn until 1135, then 069°T at 7.9 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  

3. At 1305 you fix your position 085°T, 1.1 nm from Westfield church spire. You steer 097°T at 6.4 kn until 1350, then 138°T at 9.8 kn until 1400.

   Give the 1400 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 1240 you fix your position 041°T, 2.2 nm from Heron Point Light. You steer 298°T at 5.6 kn until 1255, then 334°T at 9.1 kn until 1320.

   Give the 1320 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  

5. At 1320 you fix your position 271°T, 2.3 nm from Tern Island tower. You steer 246°T at 4.3 kn until 1400, then 356°T at 7.3 kn until 1415.

   Give the 1415 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 1450 you fix your position 286°T, 2.0 nm from Tern Island tower. You steer 165°T at 5.9 kn until 1500, then 238°T at 4.8 kn until 1525.

   Give the 1525 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 1130 you fix your position 052°T, 3.5 nm from Heron Point Light. You steer 097°T at 5.7 kn until 1210, then 355°T at 4.1 kn until 1220.

   Give the 1220 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 1250 you fix your position 234°T, 1.2 nm from Gannet Rock daybeacon. You steer 104°T at 4.0 kn until 1335, then 343°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