Worksheet 633 · Skill 3

Dead reckoning

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1. At 0725 you fix your position 076°T, 3.1 nm from Westfield church spire. You steer 059°T at 5.2 kn until 0740, then 271°T at 10.0 kn until 0805.

   Give the 0805 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 1200 you fix your position 077°T, 3.4 nm from Westfield church spire. You steer 255°T at 7.3 kn until 1220, then 069°T at 9.9 kn until 1305.

   Give the 1305 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 1010 you fix your position 359°T, 1.2 nm from Heron Point Light. You steer 101°T at 5.9 kn until 1045, then 300°T at 7.1 kn until 1055.

   Give the 1055 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 1250 you fix your position 055°T, 3.2 nm from Heron Point Light. You steer 306°T at 6.2 kn until 1310, then 112°T at 10.0 kn until 1325.

   Give the 1325 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 0740 you fix your position 067°T, 3.0 nm from Tern Island tower. You steer 251°T at 4.8 kn until 0755, then 079°T at 6.2 kn until 0805.

   Give the 0805 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 1330 you fix your position 269°T, 3.5 nm from Tern Island tower. You steer 049°T at 9.7 kn until 1355, then 096°T at 6.7 kn until 1440.

   Give the 1440 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 0800 you fix your position 323°T, 1.2 nm from Kittle water tank. You steer 065°T at 6.0 kn until 0820, then 280°T at 5.8 kn until 0835.

   Give the 0835 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 1350 you fix your position 334°T, 1.9 nm from Heron Point Light. You steer 123°T at 5.4 kn until 1425, then 288°T at 5.1 kn until 1435.

   Give the 1435 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