Worksheet 625 · Skill 3

Dead reckoning

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1. At 0700 you fix your position 242°T, 3.1 nm from Tern Island tower. You steer 083°T at 8.4 kn until 0720, then 233°T at 8.8 kn until 0730.

   Give the 0730 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 0815 you fix your position 032°T, 3.3 nm from Heron Point Light. You steer 119°T at 6.5 kn until 0845, then 308°T at 7.3 kn until 0855.

   Give the 0855 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 1510 you fix your position 148°T, 2.4 nm from Tern Island tower. You steer 036°T at 5.1 kn until 1555, then 177°T at 8.7 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  

4. At 0945 you fix your position 220°T, 1.7 nm from Tern Island tower. You steer 206°T at 8.1 kn until 1005, then 006°T at 4.0 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  

5. At 1035 you fix your position 032°T, 3.3 nm from Heron Point Light. You steer 012°T at 5.2 kn until 1055, then 261°T at 4.1 kn until 1140.

   Give the 1140 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 1330 you fix your position 255°T, 1.8 nm from Tern Island tower. You steer 145°T at 4.0 kn until 1405, then 214°T at 6.1 kn until 1420.

   Give the 1420 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  

7. At 1405 you fix your position 047°T, 2.1 nm from Westfield church spire. You steer 197°T at 6.0 kn until 1425, then 139°T at 7.9 kn until 1455.

   Give the 1455 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 1410 you fix your position 252°T, 1.4 nm from Gannet Rock daybeacon. You steer 290°T at 5.5 kn until 1425, then 171°T at 9.1 kn until 1435.

   Give the 1435 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