Worksheet 488 · Skill 3

Dead reckoning

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1. At 1410 you fix your position 281°T, 3.6 nm from Tern Island tower. You steer 285°T at 5.3 kn until 1430, then 078°T at 8.3 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  

2. At 0955 you fix your position 254°T, 3.1 nm from Tern Island tower. You steer 143°T at 8.9 kn until 1005, then 251°T at 5.9 kn until 1020.

   Give the 1020 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  

3. At 1110 you fix your position 279°T, 2.3 nm from Tern Island tower. You steer 272°T at 9.8 kn until 1130, then 161°T at 6.6 kn until 1155.

   Give the 1155 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 1040 you fix your position 061°T, 2.6 nm from Heron Point Light. You steer 293°T at 5.0 kn until 1055, then 121°T at 9.3 kn until 1120.

   Give the 1120 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 1530 you fix your position 345°T, 2.9 nm from Mill stack. You steer 184°T at 6.7 kn until 1545, then 357°T at 6.0 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  

6. At 0920 you fix your position 084°T, 3.0 nm from Westfield church spire. You steer 123°T at 8.7 kn until 0940, then 060°T at 5.9 kn until 0955.

   Give the 0955 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 1540 you fix your position 330°T, 2.3 nm from Mill stack. You steer 139°T at 6.4 kn until 1550, then 048°T at 4.4 kn until 1630.

   Give the 1630 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 0925 you fix your position 255°T, 3.5 nm from Tern Island tower. You steer 352°T at 6.6 kn until 0945, then 184°T at 7.7 kn until 1005.

   Give the 1005 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