Worksheet 90 · Skill 3

Dead reckoning

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1. At 1150 you fix your position 202°T, 1.8 nm from Tern Island tower. You steer 205°T at 7.5 kn until 1205, then 332°T at 7.6 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  

2. At 1155 you fix your position 208°T, 2.0 nm from Tern Island tower. You steer 203°T at 9.2 kn until 1210, then 058°T at 4.6 kn until 1235.

   Give the 1235 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 1050 you fix your position 023°T, 2.5 nm from Westfield church spire. You steer 312°T at 4.4 kn until 1100, then 145°T at 4.0 kn until 1145.

   Give the 1145 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 1210 you fix your position 064°T, 2.7 nm from Gannet Rock daybeacon. You steer 282°T at 8.8 kn until 1220, then 138°T at 7.9 kn until 1240.

   Give the 1240 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  

5. At 1555 you fix your position 248°T, 2.7 nm from Gannet Rock daybeacon. You steer 097°T at 7.8 kn until 1610, then 011°T at 4.1 kn until 1620.

   Give the 1620 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  

6. At 1300 you fix your position 206°T, 3.1 nm from Tern Island tower. You steer 157°T at 5.3 kn until 1325, then 046°T at 4.6 kn until 1340.

   Give the 1340 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 035°T, 1.4 nm from Heron Point Light. You steer 026°T at 7.4 kn until 0840, then 086°T at 6.8 kn until 0910.

   Give the 0910 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 1325 you fix your position 017°T, 1.5 nm from Kittle water tank. You steer 287°T at 6.1 kn until 1400, then 343°T at 6.6 kn until 1410.

   Give the 1410 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