Worksheet 271 · Skill 3

Dead reckoning

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1. At 1255 you fix your position 177°T, 1.5 nm from Gannet Rock daybeacon. You steer 072°T at 5.7 kn until 1310, then 271°T at 6.0 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 1545 you fix your position 051°T, 3.5 nm from Tern Island tower. You steer 072°T at 5.1 kn until 1600, then 217°T at 9.4 kn until 1645.

   Give the 1645 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 1425 you fix your position 238°T, 2.2 nm from Tern Island tower. You steer 284°T at 6.7 kn until 1450, then 058°T at 5.4 kn until 1535.

   Give the 1535 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  

4. At 1420 you fix your position 097°T, 2.9 nm from Westfield church spire. You steer 113°T at 5.8 kn until 1505, then 217°T at 6.6 kn until 1515.

   Give the 1515 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  

5. At 1205 you fix your position 066°T, 5.2 nm from Tern Island tower. You steer 254°T at 6.3 kn until 1235, then 170°T at 6.2 kn until 1255.

   Give the 1255 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 1120 you fix your position 027°T, 2.5 nm from Tern Island tower. You steer 179°T at 6.0 kn until 1130, then 303°T at 7.4 kn until 1145.

   Give the 1145 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 1200 you fix your position 230°T, 2.1 nm from Gannet Rock daybeacon. You steer 108°T at 6.5 kn until 1225, then 320°T at 9.3 kn until 1250.

   Give the 1250 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  

8. At 0945 you fix your position 228°T, 1.9 nm from Tern Island tower. You steer 102°T at 7.1 kn until 1000, then 297°T at 5.7 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