Worksheet 34 · Skill 3

Dead reckoning

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1. At 0845 you fix your position 147°T, 2.4 nm from Tern Island tower. You steer 246°T at 8.3 kn until 0915, then 017°T at 5.0 kn until 0955.

   Give the 0955 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 1030 you fix your position 050°T, 3.4 nm from Heron Point Light. You steer 199°T at 4.9 kn until 1045, then 057°T at 4.6 kn until 1115.

   Give the 1115 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 0700 you fix your position 282°T, 3.1 nm from Tern Island tower. You steer 206°T at 5.0 kn until 0730, then 092°T at 5.6 kn until 0755.

   Give the 0755 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 1505 you fix your position 253°T, 2.6 nm from Gannet Rock daybeacon. You steer 343°T at 6.6 kn until 1550, then 203°T at 4.8 kn until 1600.

   Give the 1600 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 1035 you fix your position 147°T, 0.9 nm from Gannet Rock daybeacon. You steer 271°T at 6.5 kn until 1045, then 312°T at 6.4 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  

6. At 1545 you fix your position 066°T, 3.5 nm from Westfield church spire. You steer 024°T at 4.6 kn until 1605, then 190°T at 4.1 kn until 1630.

   Give the 1630 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  

7. At 1125 you fix your position 040°T, 2.2 nm from Tern Island tower. You steer 131°T at 6.0 kn until 1145, then 078°T at 4.7 kn until 1210.

   Give the 1210 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 1400 you fix your position 324°T, 3.1 nm from Kittle water tank. You steer 294°T at 5.6 kn until 1420, then 123°T at 9.3 kn until 1435.

   Give the 1435 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