Worksheet 116 · Skill 3

Dead reckoning

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1. At 1425 you fix your position 020°T, 1.4 nm from Westfield church spire. You steer 105°T at 5.3 kn until 1450, then 335°T at 6.5 kn until 1515.

   Give the 1515 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 1155 you fix your position 218°T, 1.5 nm from Gannet Rock daybeacon. You steer 067°T at 8.5 kn until 1225, then 006°T at 6.1 kn until 1245.

   Give the 1245 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 0710 you fix your position 046°T, 3.2 nm from Gannet Rock daybeacon. You steer 238°T at 8.4 kn until 0730, then 297°T at 4.0 kn until 0750.

   Give the 0750 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 1555 you fix your position 046°T, 2.9 nm from Gannet Rock daybeacon. You steer 259°T at 6.3 kn until 1610, then 182°T at 9.4 kn until 1635.

   Give the 1635 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  

5. At 1040 you fix your position 137°T, 2.7 nm from Tern Island tower. You steer 079°T at 5.4 kn until 1050, then 009°T at 5.6 kn until 1110.

   Give the 1110 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 0935 you fix your position 033°T, 2.9 nm from Westfield church spire. You steer 141°T at 6.2 kn until 1010, then 019°T at 4.4 kn until 1020.

   Give the 1020 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 1400 you fix your position 047°T, 3.8 nm from Westfield church spire. You steer 083°T at 5.6 kn until 1415, then 146°T at 4.1 kn until 1455.

   Give the 1455 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 0905 you fix your position 352°T, 1.2 nm from Heron Point Light. You steer 057°T at 8.6 kn until 0935, then 227°T at 4.2 kn until 1005.

   Give the 1005 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