Worksheet 241 · Skill 3

Dead reckoning

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1. At 1405 you fix your position 071°T, 4.4 nm from Tern Island tower. You steer 239°T at 6.1 kn until 1420, then 309°T at 4.5 kn until 1500.

   Give the 1500 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 1045 you fix your position 281°T, 2.5 nm from Tern Island tower. You steer 145°T at 4.6 kn until 1055, then 179°T at 8.7 kn until 1125.

   Give the 1125 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  

3. At 1355 you fix your position 052°T, 2.3 nm from Westfield church spire. You steer 265°T at 4.2 kn until 1410, then 095°T at 9.0 kn until 1430.

   Give the 1430 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 1005 you fix your position 027°T, 1.2 nm from Kittle water tank. You steer 271°T at 7.7 kn until 1045, then 325°T at 7.0 kn until 1120.

   Give the 1120 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 1450 you fix your position 291°T, 2.6 nm from Tern Island tower. You steer 078°T at 8.6 kn until 1525, then 183°T at 8.4 kn until 1550.

   Give the 1550 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  

6. At 1410 you fix your position 214°T, 1.8 nm from Gannet Rock daybeacon. You steer 349°T at 6.8 kn until 1425, then 055°T at 7.4 kn until 1450.

   Give the 1450 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 1110 you fix your position 053°T, 3.4 nm from Heron Point Light. You steer 322°T at 7.7 kn until 1125, then 210°T at 7.8 kn until 1135.

   Give the 1135 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  

8. At 0830 you fix your position 004°T, 2.6 nm from Mill stack. You steer 340°T at 4.2 kn until 0840, then 304°T at 8.5 kn until 0905.

   Give the 0905 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