Worksheet 671 · Skill 3

Dead reckoning

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1. At 1400 you fix your position 277°T, 2.1 nm from Tern Island tower. You steer 255°T at 5.3 kn until 1440, then 041°T at 8.4 kn until 1450.

   Give the 1450 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 1450 you fix your position 256°T, 2.0 nm from Gannet Rock daybeacon. You steer 249°T at 5.0 kn until 1505, then 343°T at 5.5 kn until 1525.

   Give the 1525 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 1250 you fix your position 094°T, 2.5 nm from Westfield church spire. You steer 139°T at 6.1 kn until 1310, then 045°T at 8.9 kn until 1325.

   Give the 1325 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 1320 you fix your position 266°T, 3.4 nm from Tern Island tower. You steer 262°T at 8.5 kn until 1330, then 351°T at 6.7 kn until 1340.

   Give the 1340 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 1505 you fix your position 257°T, 3.4 nm from Tern Island tower. You steer 128°T at 9.1 kn until 1525, then 245°T at 5.5 kn until 1540.

   Give the 1540 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 1235 you fix your position 229°T, 2.0 nm from Gannet Rock daybeacon. You steer 018°T at 8.4 kn until 1315, then 248°T at 6.6 kn until 1325.

   Give the 1325 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 0930 you fix your position 055°T, 2.2 nm from Heron Point Light. You steer 104°T at 7.0 kn until 0950, then 326°T at 9.5 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  

8. At 1410 you fix your position 223°T, 3.5 nm from Tern Island tower. You steer 353°T at 9.5 kn until 1425, then 214°T at 8.5 kn until 1445.

   Give the 1445 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