Worksheet 167 · Skill 3

Dead reckoning

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1. At 1030 you fix your position 052°T, 3.7 nm from Westfield church spire. You steer 104°T at 6.7 kn until 1055, then 239°T at 9.0 kn until 1125.

   Give the 1125 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 0935 you fix your position 267°T, 2.8 nm from Gannet Rock daybeacon. You steer 210°T at 4.5 kn until 1005, then 341°T at 7.9 kn until 1035.

   Give the 1035 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 0905 you fix your position 231°T, 3.4 nm from Tern Island tower. You steer 050°T at 6.0 kn until 0915, then 306°T at 5.0 kn until 0925.

   Give the 0925 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 0950 you fix your position 290°T, 3.2 nm from Tern Island tower. You steer 281°T at 4.8 kn until 1015, then 159°T at 7.4 kn until 1035.

   Give the 1035 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  

5. At 1350 you fix your position 006°T, 3.1 nm from Mill stack. You steer 345°T at 8.2 kn until 1415, then 307°T at 8.7 kn until 1430.

   Give the 1430 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 0945 you fix your position 303°T, 0.9 nm from Gannet Rock daybeacon. You steer 067°T at 5.4 kn until 0955, then 271°T at 4.4 kn until 1010.

   Give the 1010 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 1015 you fix your position 034°T, 3.8 nm from Westfield church spire. You steer 130°T at 6.7 kn until 1035, then 237°T at 5.7 kn until 1045.

   Give the 1045 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 1100 you fix your position 208°T, 1.6 nm from Tern Island tower. You steer 091°T at 5.4 kn until 1130, then 028°T at 6.1 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