Worksheet 186 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 048°T, 2.3 nm from Westfield church spire. You steer 343°T at 4.1 kn until 1130, then 101°T at 6.3 kn until 1140.

   Give the 1140 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 1245 you fix your position 053°T, 3.1 nm from Heron Point Light. You steer 007°T at 4.2 kn until 1315, then 317°T at 4.0 kn until 1340.

   Give the 1340 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 1300 you fix your position 038°T, 1.5 nm from Gannet Rock daybeacon. You steer 359°T at 5.4 kn until 1310, then 081°T at 6.7 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 1125 you fix your position 078°T, 1.4 nm from Gannet Rock daybeacon. You steer 055°T at 8.5 kn until 1140, then 230°T at 5.2 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  

5. At 0855 you fix your position 277°T, 1.6 nm from Tern Island tower. You steer 204°T at 6.6 kn until 0915, then 084°T at 5.9 kn until 0940.

   Give the 0940 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  

6. At 1345 you fix your position 025°T, 1.7 nm from Mill stack. You steer 018°T at 5.4 kn until 1415, then 066°T at 7.4 kn until 1455.

   Give the 1455 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  

7. At 1550 you fix your position 217°T, 3.0 nm from Tern Island tower. You steer 150°T at 5.0 kn until 1615, then 261°T at 5.0 kn until 1640.

   Give the 1640 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  

8. At 1015 you fix your position 258°T, 1.9 nm from Tern Island tower. You steer 178°T at 4.3 kn until 1055, then 058°T at 10.0 kn until 1110.

   Give the 1110 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