Worksheet 498 · Skill 3

Dead reckoning

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1. At 1220 you fix your position 057°T, 2.7 nm from Westfield church spire. You steer 027°T at 5.0 kn until 1245, then 170°T at 8.8 kn until 1310.

   Give the 1310 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 1335 you fix your position 256°T, 2.8 nm from Tern Island tower. You steer 221°T at 8.0 kn until 1355, then 279°T at 5.3 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  

3. At 1035 you fix your position 100°T, 1.9 nm from Gannet Rock daybeacon. You steer 333°T at 4.0 kn until 1105, then 022°T at 6.7 kn until 1140.

   Give the 1140 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 1015 you fix your position 014°T, 2.8 nm from Mill stack. You steer 274°T at 6.0 kn until 1045, then 102°T at 8.8 kn until 1125.

   Give the 1125 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

5. At 1150 you fix your position 030°T, 3.1 nm from Heron Point Light. You steer 008°T at 9.6 kn until 1210, then 101°T at 5.9 kn until 1225.

   Give the 1225 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 1305 you fix your position 299°T, 3.2 nm from Tern Island tower. You steer 050°T at 6.4 kn until 1315, then 188°T at 9.6 kn until 1350.

   Give the 1350 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  

7. At 1355 you fix your position 028°T, 3.3 nm from Westfield church spire. You steer 119°T at 8.1 kn until 1415, then 306°T at 4.1 kn until 1500.

   Give the 1500 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 1400 you fix your position 114°T, 1.1 nm from Westfield church spire. You steer 071°T at 8.1 kn until 1420, then 113°T at 6.4 kn until 1500.

   Give the 1500 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