Worksheet 787 · Skill 3

Dead reckoning

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1. At 1015 you fix your position 212°T, 2.2 nm from Tern Island tower. You steer 281°T at 7.9 kn until 1045, then 081°T at 4.9 kn until 1105.

   Give the 1105 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 1100 you fix your position 036°T, 1.9 nm from Gannet Rock daybeacon. You steer 006°T at 9.1 kn until 1110, then 048°T at 6.3 kn until 1120.

   Give the 1120 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 0710 you fix your position 009°T, 3.1 nm from Mill stack. You steer 086°T at 7.3 kn until 0720, then 273°T at 7.7 kn until 0800.

   Give the 0800 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 1320 you fix your position 089°T, 1.8 nm from Westfield church spire. You steer 027°T at 4.9 kn until 1355, then 207°T at 7.1 kn until 1430.

   Give the 1430 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 1110 you fix your position 016°T, 2.5 nm from Mill stack. You steer 021°T at 5.8 kn until 1130, then 140°T at 5.4 kn until 1205.

   Give the 1205 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  

6. At 1230 you fix your position 077°T, 3.4 nm from Westfield church spire. You steer 035°T at 5.1 kn until 1240, then 003°T at 7.8 kn until 1250.

   Give the 1250 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  

7. At 1020 you fix your position 212°T, 2.5 nm from Gannet Rock daybeacon. You steer 039°T at 8.0 kn until 1030, then 079°T at 8.6 kn until 1045.

   Give the 1045 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 1225 you fix your position 254°T, 3.5 nm from Tern Island tower. You steer 039°T at 6.2 kn until 1255, then 315°T at 5.8 kn until 1310.

   Give the 1310 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