Worksheet 40 · Skill 3

Dead reckoning

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1. At 1220 you fix your position 054°T, 3.7 nm from Westfield church spire. You steer 059°T at 4.0 kn until 1300, then 134°T at 6.2 kn until 1315.

   Give the 1315 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 0740 you fix your position 196°T, 2.1 nm from Tern Island tower. You steer 145°T at 4.4 kn until 0815, then 283°T at 4.4 kn until 0850.

   Give the 0850 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  

3. At 0820 you fix your position 282°T, 2.1 nm from Tern Island tower. You steer 066°T at 5.3 kn until 0850, then 273°T at 6.1 kn until 0900.

   Give the 0900 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 1050 you fix your position 027°T, 4.0 nm from Westfield church spire. You steer 195°T at 5.8 kn until 1125, then 098°T at 7.5 kn until 1205.

   Give the 1205 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 1210 you fix your position 052°T, 1.6 nm from Westfield church spire. You steer 122°T at 8.1 kn until 1240, then 153°T at 5.7 kn until 1255.

   Give the 1255 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 1415 you fix your position 061°T, 2.0 nm from Heron Point Light. You steer 119°T at 4.8 kn until 1430, then 006°T at 8.1 kn until 1505.

   Give the 1505 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 1330 you fix your position 010°T, 3.5 nm from Westfield church spire. You steer 121°T at 9.3 kn until 1405, then 329°T at 5.0 kn until 1435.

   Give the 1435 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 1350 you fix your position 078°T, 2.5 nm from Tern Island tower. You steer 178°T at 6.3 kn until 1405, then 245°T at 5.9 kn until 1420.

   Give the 1420 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