Worksheet 219 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 044°T, 2.2 nm from Mill stack. You steer 300°T at 8.4 kn until 1145, then 023°T at 6.7 kn until 1220.

   Give the 1220 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 1130 you fix your position 035°T, 4.1 nm from Gannet Rock daybeacon. You steer 254°T at 6.1 kn until 1145, then 204°T at 6.7 kn until 1210.

   Give the 1210 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 0700 you fix your position 016°T, 2.0 nm from Tern Island tower. You steer 132°T at 8.8 kn until 0740, then 232°T at 8.2 kn until 0800.

   Give the 0800 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 1355 you fix your position 053°T, 1.2 nm from Westfield church spire. You steer 123°T at 4.0 kn until 1420, then 339°T at 4.6 kn until 1435.

   Give the 1435 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  

5. At 0700 you fix your position 217°T, 3.3 nm from Tern Island tower. You steer 298°T at 4.9 kn until 0740, then 354°T at 4.7 kn until 0805.

   Give the 0805 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 1025 you fix your position 238°T, 2.1 nm from Gannet Rock daybeacon. You steer 145°T at 5.6 kn until 1040, then 264°T at 5.2 kn until 1110.

   Give the 1110 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  

7. At 1600 you fix your position 349°T, 1.0 nm from Gannet Rock daybeacon. You steer 114°T at 4.5 kn until 1640, then 353°T at 7.6 kn until 1710.

   Give the 1710 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 1330 you fix your position 048°T, 1.6 nm from Westfield church spire. You steer 056°T at 6.0 kn until 1355, then 193°T at 7.9 kn until 1435.

   Give the 1435 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