Worksheet 317 · Skill 3

Dead reckoning

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1. At 1435 you fix your position 241°T, 2.9 nm from Tern Island tower. You steer 320°T at 7.8 kn until 1500, then 082°T at 8.2 kn until 1525.

   Give the 1525 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 0750 you fix your position 351°T, 2.5 nm from Tern Island tower. You steer 215°T at 5.3 kn until 0830, then 246°T at 8.5 kn until 0855.

   Give the 0855 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  

3. At 0810 you fix your position 202°T, 2.5 nm from Tern Island tower. You steer 214°T at 4.8 kn until 0820, then 273°T at 8.8 kn until 0835.

   Give the 0835 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 0940 you fix your position 077°T, 3.1 nm from Gannet Rock daybeacon. You steer 263°T at 9.7 kn until 0950, then 139°T at 7.7 kn until 1005.

   Give the 1005 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  

5. At 1400 you fix your position 051°T, 3.0 nm from Heron Point Light. You steer 046°T at 8.7 kn until 1410, then 196°T at 4.2 kn until 1420.

   Give the 1420 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 1145 you fix your position 038°T, 4.2 nm from Westfield church spire. You steer 210°T at 5.3 kn until 1200, then 074°T at 7.9 kn until 1235.

   Give the 1235 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 1200 you fix your position 357°T, 2.4 nm from Mill stack. You steer 006°T at 6.7 kn until 1220, then 223°T at 4.5 kn until 1245.

   Give the 1245 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  

8. At 0955 you fix your position 053°T, 2.2 nm from Heron Point Light. You steer 186°T at 7.2 kn until 1010, then 001°T at 7.6 kn until 1045.

   Give the 1045 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