Worksheet 680 · Skill 3

Dead reckoning

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1. At 1125 you fix your position 085°T, 1.1 nm from Heron Point Light. You steer 359°T at 5.7 kn until 1150, then 168°T at 6.4 kn until 1210.

   Give the 1210 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  

2. At 1010 you fix your position 059°T, 3.6 nm from Westfield church spire. You steer 139°T at 7.2 kn until 1040, then 009°T at 9.9 kn until 1050.

   Give the 1050 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  

3. At 1040 you fix your position 348°T, 0.8 nm from Gannet Rock daybeacon. You steer 285°T at 9.6 kn until 1115, then 139°T at 4.1 kn until 1130.

   Give the 1130 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 1340 you fix your position 250°T, 2.0 nm from Tern Island tower. You steer 158°T at 6.8 kn until 1355, then 252°T at 7.9 kn until 1420.

   Give the 1420 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  

5. At 1515 you fix your position 069°T, 3.7 nm from Tern Island tower. You steer 260°T at 5.2 kn until 1535, then 181°T at 4.7 kn until 1610.

   Give the 1610 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 1030 you fix your position 050°T, 2.2 nm from Gannet Rock daybeacon. You steer 336°T at 9.5 kn until 1045, then 171°T at 7.2 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  

7. At 0950 you fix your position 338°T, 1.1 nm from Heron Point Light. You steer 061°T at 9.8 kn until 1015, then 305°T at 4.8 kn until 1040.

   Give the 1040 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 0905 you fix your position 313°T, 3.2 nm from Tern Island tower. You steer 088°T at 8.4 kn until 0915, then 227°T at 7.6 kn until 0925.

   Give the 0925 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