Worksheet 505 · Skill 3

Dead reckoning

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1. At 1325 you fix your position 025°T, 1.1 nm from Gannet Rock daybeacon. You steer 235°T at 6.9 kn until 1335, then 042°T at 8.5 kn until 1400.

   Give the 1400 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  

2. At 1500 you fix your position 328°T, 1.8 nm from Mill stack. You steer 028°T at 6.2 kn until 1530, then 129°T at 6.4 kn until 1555.

   Give the 1555 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  

3. At 1230 you fix your position 095°T, 2.2 nm from Westfield church spire. You steer 110°T at 8.4 kn until 1240, then 249°T at 5.7 kn until 1310.

   Give the 1310 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  

4. At 0745 you fix your position 300°T, 2.8 nm from Tern Island tower. You steer 348°T at 4.7 kn until 0800, then 098°T at 9.6 kn until 0825.

   Give the 0825 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 1110 you fix your position 027°T, 3.3 nm from Westfield church spire. You steer 149°T at 7.5 kn until 1155, then 103°T at 4.8 kn until 1215.

   Give the 1215 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  

6. At 1130 you fix your position 046°T, 3.1 nm from Heron Point Light. You steer 355°T at 7.6 kn until 1205, then 104°T at 4.2 kn until 1230.

   Give the 1230 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 1115 you fix your position 239°T, 2.6 nm from Gannet Rock daybeacon. You steer 307°T at 6.3 kn until 1200, then 231°T at 7.9 kn until 1220.

   Give the 1220 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 1030 you fix your position 357°T, 3.2 nm from Mill stack. You steer 086°T at 5.5 kn until 1050, then 286°T at 6.0 kn until 1125.

   Give the 1125 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