Worksheet 410 · Skill 3

Dead reckoning

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1. At 1015 you fix your position 303°T, 3.8 nm from Tern Island tower. You steer 195°T at 9.2 kn until 1030, then 251°T at 4.3 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  

2. At 0755 you fix your position 184°T, 1.6 nm from Gannet Rock daybeacon. You steer 036°T at 6.8 kn until 0805, then 097°T at 5.8 kn until 0830.

   Give the 0830 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  

3. At 1330 you fix your position 047°T, 3.2 nm from Gannet Rock daybeacon. You steer 020°T at 5.7 kn until 1345, then 263°T at 6.4 kn until 1400.

   Give the 1400 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 1450 you fix your position 072°T, 2.4 nm from Westfield church spire. You steer 139°T at 8.4 kn until 1530, then 294°T at 5.2 kn until 1540.

   Give the 1540 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  

5. At 1145 you fix your position 290°T, 2.1 nm from Tern Island tower. You steer 352°T at 7.6 kn until 1155, then 233°T at 5.8 kn until 1210.

   Give the 1210 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 0830 you fix your position 045°T, 1.3 nm from Gannet Rock daybeacon. You steer 067°T at 9.4 kn until 0845, then 178°T at 5.6 kn until 0920.

   Give the 0920 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  

7. At 1055 you fix your position 070°T, 1.6 nm from Westfield church spire. You steer 091°T at 6.2 kn until 1105, then 224°T at 4.4 kn until 1140.

   Give the 1140 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  

8. At 1050 you fix your position 318°T, 2.7 nm from Tern Island tower. You steer 228°T at 6.2 kn until 1120, then 078°T at 9.3 kn until 1130.

   Give the 1130 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