Worksheet 491 · Skill 3

Dead reckoning

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1. At 0740 you fix your position 200°T, 2.0 nm from Tern Island tower. You steer 281°T at 8.9 kn until 0810, then 321°T at 6.5 kn until 0825.

   Give the 0825 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  

2. At 1130 you fix your position 025°T, 2.8 nm from Gannet Rock daybeacon. You steer 217°T at 4.0 kn until 1200, then 023°T at 5.9 kn until 1220.

   Give the 1220 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 1535 you fix your position 049°T, 3.2 nm from Heron Point Light. You steer 003°T at 5.8 kn until 1620, then 276°T at 5.8 kn until 1630.

   Give the 1630 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 1230 you fix your position 034°T, 2.7 nm from Heron Point Light. You steer 026°T at 5.3 kn until 1250, then 324°T at 4.0 kn until 1335.

   Give the 1335 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 0730 you fix your position 231°T, 2.4 nm from Tern Island tower. You steer 120°T at 6.8 kn until 0805, then 158°T at 4.0 kn until 0825.

   Give the 0825 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

6. At 1135 you fix your position 234°T, 3.2 nm from Tern Island tower. You steer 105°T at 4.5 kn until 1155, then 221°T at 8.9 kn until 1205.

   Give the 1205 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  

7. At 0920 you fix your position 230°T, 1.7 nm from Tern Island tower. You steer 357°T at 4.6 kn until 0945, then 274°T at 8.8 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  

8. At 0840 you fix your position 071°T, 2.3 nm from Heron Point Light. You steer 268°T at 6.1 kn until 0850, then 080°T at 9.5 kn until 0900.

   Give the 0900 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