Worksheet 251 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 047°T, 3.5 nm from Heron Point Light. You steer 143°T at 6.1 kn until 1050, then 200°T at 7.8 kn until 1105.

   Give the 1105 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  

2. At 0945 you fix your position 254°T, 1.7 nm from Tern Island tower. You steer 260°T at 5.3 kn until 1015, then 194°T at 6.3 kn until 1030.

   Give the 1030 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  

3. At 1515 you fix your position 298°T, 2.3 nm from Tern Island tower. You steer 287°T at 4.2 kn until 1600, then 175°T at 8.2 kn until 1620.

   Give the 1620 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 1425 you fix your position 059°T, 2.6 nm from Heron Point Light. You steer 320°T at 5.6 kn until 1500, then 122°T at 4.0 kn until 1515.

   Give the 1515 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  

5. At 1355 you fix your position 205°T, 1.4 nm from Tern Island tower. You steer 123°T at 8.0 kn until 1410, then 050°T at 9.3 kn until 1420.

   Give the 1420 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 1410 you fix your position 332°T, 1.7 nm from Tern Island tower. You steer 272°T at 4.6 kn until 1455, then 142°T at 8.2 kn until 1535.

   Give the 1535 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 1115 you fix your position 148°T, 1.8 nm from Westfield church spire. You steer 120°T at 4.8 kn until 1130, then 340°T at 7.2 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  

8. At 0705 you fix your position 262°T, 3.2 nm from Tern Island tower. You steer 307°T at 9.3 kn until 0715, then 152°T at 8.0 kn until 0735.

   Give the 0735 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