Worksheet 198 · Skill 3

Dead reckoning

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1. At 1005 you fix your position 074°T, 3.6 nm from Tern Island tower. You steer 213°T at 4.6 kn until 1015, then 295°T at 9.5 kn until 1025.

   Give the 1025 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 1225 you fix your position 170°T, 0.9 nm from Gannet Rock daybeacon. You steer 250°T at 9.4 kn until 1255, then 334°T at 6.9 kn until 1335.

   Give the 1335 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 1505 you fix your position 020°T, 1.0 nm from Gannet Rock daybeacon. You steer 168°T at 9.0 kn until 1525, then 290°T at 7.4 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  

4. At 1120 you fix your position 338°T, 2.4 nm from Tern Island tower. You steer 233°T at 6.8 kn until 1145, then 106°T at 5.1 kn until 1155.

   Give the 1155 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 1205 you fix your position 303°T, 1.6 nm from Kittle water tank. You steer 260°T at 7.1 kn until 1235, then 355°T at 6.4 kn until 1315.

   Give the 1315 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 1115 you fix your position 313°T, 2.1 nm from Tern Island tower. You steer 060°T at 4.4 kn until 1140, then 270°T at 9.0 kn until 1155.

   Give the 1155 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 0845 you fix your position 235°T, 2.8 nm from Tern Island tower. You steer 235°T at 4.6 kn until 0920, then 101°T at 9.8 kn until 0945.

   Give the 0945 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  

8. At 1220 you fix your position 266°T, 3.0 nm from Tern Island tower. You steer 056°T at 6.5 kn until 1255, then 222°T at 7.7 kn until 1305.

   Give the 1305 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