Worksheet 43 · Skill 3

Dead reckoning

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1. At 1445 you fix your position 195°T, 1.3 nm from Gannet Rock daybeacon. You steer 322°T at 4.5 kn until 1530, then 092°T at 6.9 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  

2. At 1220 you fix your position 281°T, 3.0 nm from Tern Island tower. You steer 125°T at 9.9 kn until 1245, then 160°T at 8.4 kn until 1305.

   Give the 1305 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 1245 you fix your position 026°T, 2.6 nm from Kittle water tank. You steer 262°T at 5.4 kn until 1300, then 028°T at 4.6 kn until 1320.

   Give the 1320 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 084°T, 3.5 nm from Westfield church spire. You steer 133°T at 10.0 kn until 1435, then 079°T at 9.1 kn until 1505.

   Give the 1505 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  

5. At 1420 you fix your position 218°T, 1.9 nm from Gannet Rock daybeacon. You steer 350°T at 6.7 kn until 1440, then 266°T at 9.0 kn until 1520.

   Give the 1520 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 1420 you fix your position 256°T, 2.8 nm from Tern Island tower. You steer 147°T at 8.0 kn until 1435, then 326°T at 7.8 kn until 1455.

   Give the 1455 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 1005 you fix your position 199°T, 2.2 nm from Tern Island tower. You steer 230°T at 4.5 kn until 1035, then 028°T at 7.6 kn until 1055.

   Give the 1055 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 0810 you fix your position 054°T, 3.4 nm from Westfield church spire. You steer 152°T at 9.7 kn until 0850, then 295°T at 6.9 kn until 0900.

   Give the 0900 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