Worksheet 153 · Skill 3

Dead reckoning

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1. At 1320 you fix your position 059°T, 1.8 nm from Tern Island tower. You steer 141°T at 7.2 kn until 1355, then 346°T at 7.3 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  

2. At 1310 you fix your position 138°T, 2.5 nm from Tern Island tower. You steer 279°T at 7.3 kn until 1340, then 357°T at 4.3 kn until 1410.

   Give the 1410 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 0755 you fix your position 081°T, 2.1 nm from Tern Island tower. You steer 283°T at 4.6 kn until 0805, then 146°T at 4.8 kn until 0820.

   Give the 0820 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 0715 you fix your position 019°T, 3.3 nm from Westfield church spire. You steer 162°T at 7.4 kn until 0750, then 030°T at 6.8 kn until 0800.

   Give the 0800 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 0910 you fix your position 104°T, 2.4 nm from Westfield church spire. You steer 026°T at 4.4 kn until 0935, then 147°T at 6.5 kn until 1005.

   Give the 1005 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  

6. At 1145 you fix your position 055°T, 1.0 nm from Heron Point Light. You steer 349°T at 4.2 kn until 1200, then 090°T at 6.6 kn until 1240.

   Give the 1240 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 1230 you fix your position 014°T, 2.3 nm from Mill stack. You steer 249°T at 6.4 kn until 1240, then 124°T at 9.4 kn until 1250.

   Give the 1250 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  

8. At 1400 you fix your position 044°T, 4.2 nm from Westfield church spire. You steer 238°T at 4.8 kn until 1430, then 077°T at 8.9 kn until 1440.

   Give the 1440 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