Worksheet 340 · Skill 3

Dead reckoning

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1. At 1450 you fix your position 078°T, 2.7 nm from Westfield church spire. You steer 173°T at 6.3 kn until 1530, then 080°T at 10.0 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  

2. At 1250 you fix your position 055°T, 2.0 nm from Heron Point Light. You steer 032°T at 5.3 kn until 1310, then 084°T at 5.2 kn until 1345.

   Give the 1345 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 1350 you fix your position 073°T, 2.0 nm from Heron Point Light. You steer 085°T at 6.0 kn until 1400, then 209°T at 4.6 kn until 1410.

   Give the 1410 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  

4. At 1345 you fix your position 061°T, 3.1 nm from Westfield church spire. You steer 335°T at 5.0 kn until 1355, then 189°T at 5.2 kn until 1410.

   Give the 1410 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 1130 you fix your position 309°T, 2.4 nm from Tern Island tower. You steer 176°T at 4.6 kn until 1210, then 206°T at 4.7 kn until 1245.

   Give the 1245 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 1310 you fix your position 082°T, 2.8 nm from Westfield church spire. You steer 050°T at 7.1 kn until 1335, then 316°T at 8.7 kn until 1345.

   Give the 1345 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 0950 you fix your position 261°T, 2.7 nm from Tern Island tower. You steer 352°T at 9.3 kn until 1000, then 126°T at 5.0 kn until 1015.

   Give the 1015 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 1305 you fix your position 036°T, 1.1 nm from Kittle water tank. You steer 018°T at 4.6 kn until 1345, then 231°T at 8.8 kn until 1400.

   Give the 1400 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