Worksheet 500 · Skill 3

Dead reckoning

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1. At 1250 you fix your position 266°T, 2.7 nm from Tern Island tower. You steer 334°T at 4.9 kn until 1310, then 189°T at 6.8 kn until 1345.

   Give the 1345 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  

2. At 1245 you fix your position 072°T, 3.7 nm from Westfield church spire. You steer 041°T at 9.8 kn until 1300, then 280°T at 7.2 kn until 1315.

   Give the 1315 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 1230 you fix your position 000°T, 1.7 nm from Tern Island tower. You steer 232°T at 9.8 kn until 1305, then 121°T at 4.7 kn until 1315.

   Give the 1315 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  

4. At 1300 you fix your position 226°T, 2.5 nm from Gannet Rock daybeacon. You steer 292°T at 8.6 kn until 1340, then 066°T at 7.3 kn until 1350.

   Give the 1350 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 1025 you fix your position 063°T, 2.2 nm from Westfield church spire. You steer 153°T at 9.5 kn until 1050, then 291°T at 8.8 kn until 1105.

   Give the 1105 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 1240 you fix your position 037°T, 2.0 nm from Westfield church spire. You steer 073°T at 4.1 kn until 1315, then 142°T at 9.6 kn until 1355.

   Give the 1355 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 1505 you fix your position 089°T, 2.8 nm from Westfield church spire. You steer 123°T at 4.7 kn until 1550, then 205°T at 4.8 kn until 1600.

   Give the 1600 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 0900 you fix your position 053°T, 1.8 nm from Gannet Rock daybeacon. You steer 352°T at 4.4 kn until 0940, then 066°T at 5.1 kn until 1000.

   Give the 1000 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