Worksheet 535 · Skill 3

Dead reckoning

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1. At 0725 you fix your position 255°T, 2.6 nm from Gannet Rock daybeacon. You steer 236°T at 9.3 kn until 0745, then 050°T at 9.1 kn until 0825.

   Give the 0825 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  

2. At 1000 you fix your position 302°T, 3.0 nm from Tern Island tower. You steer 216°T at 5.0 kn until 1010, then 169°T at 8.7 kn until 1030.

   Give the 1030 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 1135 you fix your position 079°T, 2.0 nm from Westfield church spire. You steer 211°T at 5.6 kn until 1145, then 034°T at 4.5 kn until 1155.

   Give the 1155 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  

4. At 1220 you fix your position 057°T, 3.6 nm from Westfield church spire. You steer 124°T at 6.5 kn until 1230, then 009°T at 5.0 kn until 1240.

   Give the 1240 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 0820 you fix your position 048°T, 3.2 nm from Gannet Rock daybeacon. You steer 227°T at 5.9 kn until 0830, then 350°T at 6.8 kn until 0845.

   Give the 0845 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 1405 you fix your position 000°T, 1.8 nm from Kittle water tank. You steer 299°T at 7.5 kn until 1415, then 055°T at 6.9 kn until 1425.

   Give the 1425 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 0825 you fix your position 194°T, 2.0 nm from Tern Island tower. You steer 173°T at 9.7 kn until 0835, then 252°T at 8.2 kn until 0900.

   Give the 0900 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 1005 you fix your position 048°T, 2.2 nm from Westfield church spire. You steer 185°T at 6.2 kn until 1030, then 048°T at 6.9 kn until 1115.

   Give the 1115 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