Worksheet 246 · Skill 3

Dead reckoning

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1. At 1040 you fix your position 085°T, 3.4 nm from Westfield church spire. You steer 075°T at 4.5 kn until 1115, then 274°T at 8.9 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  

2. At 1030 you fix your position 236°T, 1.9 nm from Tern Island tower. You steer 168°T at 9.8 kn until 1045, then 223°T at 9.1 kn until 1100.

   Give the 1100 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  

3. At 0710 you fix your position 187°T, 2.0 nm from Tern Island tower. You steer 263°T at 8.8 kn until 0745, then 351°T at 5.1 kn until 0825.

   Give the 0825 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 1535 you fix your position 070°T, 3.5 nm from Tern Island tower. You steer 344°T at 6.9 kn until 1545, then 164°T at 8.3 kn until 1630.

   Give the 1630 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 1100 you fix your position 044°T, 3.0 nm from Gannet Rock daybeacon. You steer 332°T at 5.6 kn until 1115, then 158°T at 9.7 kn until 1135.

   Give the 1135 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 1455 you fix your position 200°T, 2.1 nm from Tern Island tower. You steer 119°T at 6.5 kn until 1525, then 020°T at 7.6 kn until 1555.

   Give the 1555 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 0935 you fix your position 011°T, 2.7 nm from Westfield church spire. You steer 134°T at 4.8 kn until 1015, then 212°T at 7.8 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  

8. At 1130 you fix your position 290°T, 1.6 nm from Tern Island tower. You steer 272°T at 8.1 kn until 1210, then 157°T at 6.9 kn until 1235.

   Give the 1235 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