Worksheet 17 · Skill 3

Dead reckoning

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1. At 1320 you fix your position 028°T, 3.0 nm from Gannet Rock daybeacon. You steer 170°T at 8.8 kn until 1335, then 310°T at 9.0 kn until 1350.

   Give the 1350 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 1100 you fix your position 232°T, 2.5 nm from Tern Island tower. You steer 313°T at 5.4 kn until 1115, then 082°T at 4.6 kn until 1135.

   Give the 1135 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 1440 you fix your position 307°T, 2.4 nm from Tern Island tower. You steer 170°T at 8.8 kn until 1505, then 107°T at 7.5 kn until 1550.

   Give the 1550 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 1125 you fix your position 064°T, 2.0 nm from Gannet Rock daybeacon. You steer 264°T at 7.7 kn until 1210, then 068°T at 7.0 kn until 1225.

   Give the 1225 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 1300 you fix your position 063°T, 2.4 nm from Westfield church spire. You steer 167°T at 6.1 kn until 1335, then 096°T at 4.6 kn until 1400.

   Give the 1400 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  

6. At 1530 you fix your position 350°T, 3.2 nm from Mill stack. You steer 019°T at 7.4 kn until 1545, then 283°T at 9.0 kn until 1610.

   Give the 1610 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  

7. At 1105 you fix your position 069°T, 3.5 nm from Tern Island tower. You steer 201°T at 4.2 kn until 1135, then 003°T at 6.3 kn until 1205.

   Give the 1205 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 0805 you fix your position 059°T, 2.9 nm from Westfield church spire. You steer 157°T at 8.2 kn until 0835, then 109°T at 8.0 kn until 0855.

   Give the 0855 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