Worksheet 268 · Skill 3

Dead reckoning

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1. At 0815 you fix your position 286°T, 3.9 nm from Tern Island tower. You steer 095°T at 9.1 kn until 0825, then 266°T at 6.1 kn until 0855.

   Give the 0855 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 208°T, 3.0 nm from Tern Island tower. You steer 070°T at 8.9 kn until 0835, then 254°T at 8.8 kn until 0850.

   Give the 0850 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 1125 you fix your position 347°T, 3.2 nm from Mill stack. You steer 068°T at 4.1 kn until 1210, then 238°T at 4.7 kn until 1220.

   Give the 1220 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  

4. At 1400 you fix your position 317°T, 1.5 nm from Gannet Rock daybeacon. You steer 206°T at 4.3 kn until 1440, then 072°T at 5.7 kn until 1520.

   Give the 1520 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  

5. At 1420 you fix your position 070°T, 3.4 nm from Westfield church spire. You steer 269°T at 4.6 kn until 1445, then 310°T at 8.8 kn until 1455.

   Give the 1455 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  

6. At 1200 you fix your position 028°T, 3.2 nm from Westfield church spire. You steer 142°T at 8.8 kn until 1230, then 333°T at 7.4 kn until 1300.

   Give the 1300 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 1310 you fix your position 257°T, 3.6 nm from Tern Island tower. You steer 324°T at 6.9 kn until 1330, then 133°T at 7.0 kn until 1415.

   Give the 1415 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 1430 you fix your position 301°T, 4.6 nm from Tern Island tower. You steer 186°T at 7.3 kn until 1445, then 286°T at 4.9 kn until 1510.

   Give the 1510 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