Worksheet 261 · Skill 3

Dead reckoning

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1. At 1110 you fix your position 058°T, 3.0 nm from Tern Island tower. You steer 150°T at 8.8 kn until 1125, then 237°T at 8.4 kn until 1145.

   Give the 1145 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 1520 you fix your position 150°T, 1.6 nm from Westfield church spire. You steer 014°T at 9.3 kn until 1530, then 062°T at 6.6 kn until 1540.

   Give the 1540 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  

3. At 1400 you fix your position 353°T, 2.7 nm from Mill stack. You steer 067°T at 6.9 kn until 1410, then 295°T at 7.6 kn until 1435.

   Give the 1435 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

4. At 1130 you fix your position 051°T, 4.1 nm from Westfield church spire. You steer 051°T at 4.8 kn until 1150, then 200°T at 8.7 kn until 1230.

   Give the 1230 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

5. At 1010 you fix your position 010°T, 2.0 nm from Mill stack. You steer 304°T at 7.6 kn until 1035, then 004°T at 6.1 kn until 1105.

   Give the 1105 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 1220 you fix your position 061°T, 2.5 nm from Gannet Rock daybeacon. You steer 263°T at 8.9 kn until 1305, then 352°T at 7.3 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  

7. At 1155 you fix your position 005°T, 3.4 nm from Westfield church spire. You steer 176°T at 4.8 kn until 1225, then 073°T at 5.6 kn until 1310.

   Give the 1310 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 240°T, 2.5 nm from Tern Island tower. You steer 144°T at 9.7 kn until 1405, then 243°T at 5.6 kn until 1420.

   Give the 1420 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