Worksheet 801 · Skill 3

Dead reckoning

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1. At 1025 you fix your position 039°T, 2.4 nm from Gannet Rock daybeacon. You steer 146°T at 4.4 kn until 1050, then 302°T at 4.4 kn until 1105.

   Give the 1105 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 1555 you fix your position 334°T, 1.2 nm from Tern Island tower. You steer 322°T at 5.1 kn until 1615, then 231°T at 5.1 kn until 1650.

   Give the 1650 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  

3. At 1325 you fix your position 179°T, 1.4 nm from Gannet Rock daybeacon. You steer 288°T at 8.7 kn until 1355, then 248°T at 8.9 kn until 1410.

   Give the 1410 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  

4. At 0935 you fix your position 101°T, 2.3 nm from Westfield church spire. You steer 000°T at 4.3 kn until 1005, then 185°T at 4.4 kn until 1025.

   Give the 1025 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 1100 you fix your position 216°T, 1.8 nm from Tern Island tower. You steer 320°T at 4.2 kn until 1110, then 209°T at 6.3 kn until 1125.

   Give the 1125 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  

6. At 1440 you fix your position 357°T, 2.0 nm from Tern Island tower. You steer 228°T at 6.1 kn until 1500, then 062°T at 5.4 kn until 1520.

   Give the 1520 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 1005 you fix your position 275°T, 3.6 nm from Tern Island tower. You steer 049°T at 4.9 kn until 1030, then 246°T at 5.0 kn until 1105.

   Give the 1105 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 1155 you fix your position 036°T, 1.2 nm from Heron Point Light. You steer 001°T at 7.1 kn until 1220, then 230°T at 8.6 kn until 1230.

   Give the 1230 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