Worksheet 448 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 260°T, 2.0 nm from Tern Island tower. You steer 176°T at 7.9 kn until 1300, then 236°T at 4.0 kn until 1310.

   Give the 1310 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  

2. At 1145 you fix your position 089°T, 2.2 nm from Westfield church spire. You steer 349°T at 6.5 kn until 1155, then 097°T at 6.1 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  

3. At 1145 you fix your position 034°T, 1.2 nm from Westfield church spire. You steer 157°T at 6.7 kn until 1215, then 091°T at 6.6 kn until 1240.

   Give the 1240 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  

4. At 1255 you fix your position 055°T, 4.1 nm from Tern Island tower. You steer 173°T at 8.2 kn until 1320, then 267°T at 8.7 kn until 1405.

   Give the 1405 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 1520 you fix your position 009°T, 1.4 nm from Heron Point Light. You steer 340°T at 6.8 kn until 1545, then 128°T at 4.3 kn until 1615.

   Give the 1615 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  

6. At 1255 you fix your position 069°T, 3.4 nm from Westfield church spire. You steer 232°T at 7.6 kn until 1310, then 335°T at 6.1 kn until 1340.

   Give the 1340 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  

7. At 0755 you fix your position 092°T, 2.8 nm from Westfield church spire. You steer 046°T at 6.8 kn until 0815, then 302°T at 8.9 kn until 0835.

   Give the 0835 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 1210 you fix your position 009°T, 2.1 nm from Heron Point Light. You steer 017°T at 9.5 kn until 1240, then 104°T at 4.1 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