Worksheet 139 · Skill 3

Dead reckoning

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1. At 1225 you fix your position 057°T, 3.1 nm from Westfield church spire. You steer 062°T at 5.7 kn until 1235, then 250°T at 5.5 kn until 1300.

   Give the 1300 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 0950 you fix your position 072°T, 2.6 nm from Heron Point Light. You steer 311°T at 8.6 kn until 1020, then 352°T at 7.6 kn until 1030.

   Give the 1030 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 1240 you fix your position 341°T, 2.4 nm from Mill stack. You steer 202°T at 5.7 kn until 1255, then 359°T at 9.6 kn until 1315.

   Give the 1315 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 0945 you fix your position 167°T, 1.5 nm from Gannet Rock daybeacon. You steer 300°T at 9.0 kn until 1015, then 257°T at 5.4 kn until 1100.

   Give the 1100 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 1235 you fix your position 015°T, 2.8 nm from Westfield church spire. You steer 103°T at 7.4 kn until 1300, then 165°T at 4.7 kn until 1320.

   Give the 1320 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 0900 you fix your position 045°T, 2.9 nm from Heron Point Light. You steer 032°T at 8.6 kn until 0940, then 238°T at 8.6 kn until 0955.

   Give the 0955 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 1055 you fix your position 083°T, 2.3 nm from Westfield church spire. You steer 058°T at 6.6 kn until 1125, then 156°T at 9.8 kn until 1140.

   Give the 1140 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 0705 you fix your position 331°T, 1.4 nm from Gannet Rock daybeacon. You steer 235°T at 5.0 kn until 0730, then 281°T at 6.6 kn until 0800.

   Give the 0800 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