Worksheet 372 · Skill 3

Dead reckoning

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1. At 1355 you fix your position 087°T, 0.9 nm from Heron Point Light. You steer 064°T at 5.7 kn until 1425, then 322°T at 4.8 kn until 1445.

   Give the 1445 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 1230 you fix your position 048°T, 1.7 nm from Heron Point Light. You steer 336°T at 8.6 kn until 1250, then 115°T at 8.9 kn until 1335.

   Give the 1335 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  

3. At 1015 you fix your position 344°T, 2.9 nm from Kittle water tank. You steer 004°T at 7.7 kn until 1055, then 146°T at 9.5 kn until 1115.

   Give the 1115 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 1100 you fix your position 024°T, 2.1 nm from Westfield church spire. You steer 165°T at 4.5 kn until 1145, then 071°T at 10.0 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 1410 you fix your position 170°T, 1.4 nm from Tern Island tower. You steer 120°T at 5.4 kn until 1425, then 001°T at 4.2 kn until 1450.

   Give the 1450 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 0955 you fix your position 325°T, 1.3 nm from Kittle water tank. You steer 022°T at 7.0 kn until 1010, then 137°T at 5.5 kn until 1030.

   Give the 1030 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  

7. At 1205 you fix your position 055°T, 3.6 nm from Westfield church spire. You steer 191°T at 6.4 kn until 1235, then 347°T at 5.6 kn until 1255.

   Give the 1255 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  

8. At 0750 you fix your position 014°T, 2.3 nm from Mill stack. You steer 269°T at 9.2 kn until 0810, then 014°T at 8.2 kn until 0850.

   Give the 0850 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