Worksheet 577 · Skill 3

Dead reckoning

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1. At 1010 you fix your position 260°T, 3.5 nm from Tern Island tower. You steer 181°T at 5.1 kn until 1045, then 353°T at 4.8 kn until 1120.

   Give the 1120 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 0935 you fix your position 248°T, 1.6 nm from Gannet Rock daybeacon. You steer 231°T at 4.7 kn until 0955, then 348°T at 9.8 kn until 1010.

   Give the 1010 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 1025 you fix your position 235°T, 2.3 nm from Gannet Rock daybeacon. You steer 304°T at 4.1 kn until 1110, then 083°T at 4.4 kn until 1125.

   Give the 1125 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  

4. At 1340 you fix your position 033°T, 3.5 nm from Gannet Rock daybeacon. You steer 242°T at 4.4 kn until 1355, then 021°T at 5.6 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  

5. At 1345 you fix your position 328°T, 1.3 nm from Gannet Rock daybeacon. You steer 268°T at 5.0 kn until 1430, then 158°T at 9.0 kn until 1455.

   Give the 1455 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 1450 you fix your position 335°T, 1.7 nm from Tern Island tower. You steer 221°T at 5.6 kn until 1515, then 253°T at 7.5 kn until 1545.

   Give the 1545 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 1130 you fix your position 341°T, 2.9 nm from Kittle water tank. You steer 144°T at 4.8 kn until 1145, then 091°T at 6.8 kn until 1200.

   Give the 1200 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  

8. At 0950 you fix your position 239°T, 2.9 nm from Tern Island tower. You steer 105°T at 7.8 kn until 1000, then 353°T at 7.9 kn until 1015.

   Give the 1015 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