Worksheet 20 · Skill 3

Dead reckoning

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1. At 1415 you fix your position 066°T, 3.2 nm from Westfield church spire. You steer 057°T at 4.0 kn until 1430, then 280°T at 9.7 kn until 1440.

   Give the 1440 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  

2. At 1400 you fix your position 041°T, 2.1 nm from Westfield church spire. You steer 162°T at 7.3 kn until 1440, then 097°T at 9.4 kn until 1515.

   Give the 1515 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  

3. At 1010 you fix your position 063°T, 3.3 nm from Westfield church spire. You steer 196°T at 6.1 kn until 1020, then 016°T at 5.9 kn until 1030.

   Give the 1030 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 1300 you fix your position 278°T, 2.3 nm from Tern Island tower. You steer 312°T at 6.2 kn until 1330, then 196°T at 8.0 kn until 1350.

   Give the 1350 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 1025 you fix your position 044°T, 1.9 nm from Kittle water tank. You steer 293°T at 8.7 kn until 1040, then 255°T at 5.5 kn until 1125.

   Give the 1125 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  

6. At 1210 you fix your position 019°T, 2.7 nm from Westfield church spire. You steer 092°T at 4.8 kn until 1245, then 131°T at 7.4 kn until 1305.

   Give the 1305 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 1515 you fix your position 357°T, 1.3 nm from Gannet Rock daybeacon. You steer 353°T at 5.4 kn until 1545, then 094°T at 4.1 kn until 1615.

   Give the 1615 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  

8. At 1455 you fix your position 241°T, 2.9 nm from Tern Island tower. You steer 248°T at 5.7 kn until 1540, then 027°T at 6.1 kn until 1615.

   Give the 1615 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