Worksheet 229 · Skill 3

Dead reckoning

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1. At 0955 you fix your position 085°T, 3.6 nm from Westfield church spire. You steer 151°T at 7.6 kn until 1015, then 230°T at 4.4 kn until 1035.

   Give the 1035 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  

2. At 0725 you fix your position 219°T, 1.3 nm from Tern Island tower. You steer 226°T at 6.6 kn until 0740, then 106°T at 9.8 kn until 0810.

   Give the 0810 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 0940 you fix your position 343°T, 2.6 nm from Mill stack. You steer 338°T at 5.6 kn until 0950, then 172°T at 6.3 kn until 1015.

   Give the 1015 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 0945 you fix your position 338°T, 2.2 nm from Tern Island tower. You steer 047°T at 4.6 kn until 0955, then 208°T at 7.8 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  

5. At 1010 you fix your position 033°T, 3.8 nm from Westfield church spire. You steer 124°T at 9.1 kn until 1020, then 198°T at 4.4 kn until 1050.

   Give the 1050 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 275°T, 1.1 nm from Gannet Rock daybeacon. You steer 049°T at 5.5 kn until 1245, then 136°T at 5.0 kn until 1325.

   Give the 1325 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 1155 you fix your position 055°T, 1.5 nm from Heron Point Light. You steer 083°T at 6.8 kn until 1240, then 116°T at 8.2 kn until 1250.

   Give the 1250 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  

8. At 1235 you fix your position 300°T, 3.5 nm from Tern Island tower. You steer 279°T at 5.9 kn until 1315, then 102°T at 7.9 kn until 1400.

   Give the 1400 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