Worksheet 221 · Skill 3

Dead reckoning

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1. At 1010 you fix your position 272°T, 3.6 nm from Tern Island tower. You steer 264°T at 6.5 kn until 1025, then 113°T at 9.8 kn until 1110.

   Give the 1110 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  

2. At 1340 you fix your position 038°T, 1.8 nm from Kittle water tank. You steer 344°T at 8.2 kn until 1400, then 235°T at 4.9 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  

3. At 0950 you fix your position 007°T, 1.8 nm from Heron Point Light. You steer 067°T at 6.6 kn until 1025, then 014°T at 5.5 kn until 1050.

   Give the 1050 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 1520 you fix your position 036°T, 2.9 nm from Tern Island tower. You steer 119°T at 4.4 kn until 1540, then 257°T at 7.7 kn until 1555.

   Give the 1555 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 1015 you fix your position 008°T, 2.1 nm from Westfield church spire. You steer 116°T at 6.8 kn until 1055, then 339°T at 5.8 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  

6. At 1030 you fix your position 005°T, 3.5 nm from Westfield church spire. You steer 153°T at 5.1 kn until 1055, then 057°T at 5.7 kn until 1105.

   Give the 1105 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 1440 you fix your position 062°T, 3.7 nm from Tern Island tower. You steer 306°T at 5.9 kn until 1450, then 190°T at 4.6 kn until 1515.

   Give the 1515 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 0755 you fix your position 058°T, 3.0 nm from Gannet Rock daybeacon. You steer 268°T at 5.1 kn until 0835, then 033°T at 5.9 kn until 0900.

   Give the 0900 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