Worksheet 490 · Skill 3

Dead reckoning

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1. At 1240 you fix your position 254°T, 1.8 nm from Tern Island tower. You steer 256°T at 7.9 kn until 1300, then 112°T at 7.2 kn until 1325.

   Give the 1325 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 1125 you fix your position 338°T, 1.1 nm from Gannet Rock daybeacon. You steer 243°T at 4.8 kn until 1210, then 070°T at 7.8 kn until 1220.

   Give the 1220 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 1035 you fix your position 222°T, 3.3 nm from Tern Island tower. You steer 295°T at 4.8 kn until 1045, then 106°T at 7.0 kn until 1115.

   Give the 1115 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 0735 you fix your position 252°T, 0.9 nm from Gannet Rock daybeacon. You steer 148°T at 4.8 kn until 0805, then 052°T at 6.2 kn until 0835.

   Give the 0835 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 1435 you fix your position 034°T, 2.0 nm from Gannet Rock daybeacon. You steer 137°T at 5.7 kn until 1505, then 323°T at 5.6 kn until 1515.

   Give the 1515 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  

6. At 1300 you fix your position 310°T, 1.7 nm from Kittle water tank. You steer 285°T at 6.1 kn until 1335, then 058°T at 6.3 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  

7. At 1320 you fix your position 047°T, 3.5 nm from Heron Point Light. You steer 136°T at 6.3 kn until 1335, then 318°T at 8.4 kn until 1400.

   Give the 1400 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  

8. At 1555 you fix your position 122°T, 1.5 nm from Westfield church spire. You steer 123°T at 5.5 kn until 1625, then 069°T at 6.6 kn until 1700.

   Give the 1700 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