Worksheet 735 · Skill 3

Dead reckoning

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1. At 1425 you fix your position 358°T, 2.1 nm from Tern Island tower. You steer 235°T at 8.1 kn until 1510, then 114°T at 9.1 kn until 1540.

   Give the 1540 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 1405 you fix your position 281°T, 2.1 nm from Tern Island tower. You steer 287°T at 6.9 kn until 1415, then 005°T at 6.4 kn until 1430.

   Give the 1430 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 1230 you fix your position 322°T, 2.2 nm from Tern Island tower. You steer 208°T at 4.3 kn until 1310, then 152°T at 5.0 kn until 1330.

   Give the 1330 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 0840 you fix your position 203°T, 1.9 nm from Tern Island tower. You steer 233°T at 6.1 kn until 0910, then 325°T at 6.1 kn until 0925.

   Give the 0925 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 0930 you fix your position 090°T, 1.9 nm from Westfield church spire. You steer 004°T at 7.1 kn until 0950, then 319°T at 4.2 kn until 1015.

   Give the 1015 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  

6. At 1210 you fix your position 359°T, 3.2 nm from Mill stack. You steer 063°T at 8.1 kn until 1225, then 293°T at 9.5 kn until 1310.

   Give the 1310 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  

7. At 1240 you fix your position 006°T, 2.1 nm from Mill stack. You steer 105°T at 6.7 kn until 1300, then 015°T at 8.1 kn until 1315.

   Give the 1315 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 0920 you fix your position 245°T, 2.1 nm from Tern Island tower. You steer 247°T at 5.0 kn until 1000, then 049°T at 7.8 kn until 1040.

   Give the 1040 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