Worksheet 93 · Skill 3

Dead reckoning

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1. At 1350 you fix your position 042°T, 1.4 nm from Tern Island tower. You steer 092°T at 8.1 kn until 1400, then 055°T at 9.2 kn until 1410.

   Give the 1410 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 1345 you fix your position 298°T, 4.4 nm from Tern Island tower. You steer 203°T at 5.3 kn until 1355, then 074°T at 9.2 kn until 1405.

   Give the 1405 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 056°T, 3.5 nm from Tern Island tower. You steer 136°T at 4.2 kn until 1245, then 055°T at 7.1 kn until 1255.

   Give the 1255 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 1210 you fix your position 091°T, 2.4 nm from Westfield church spire. You steer 016°T at 9.5 kn until 1220, then 319°T at 4.6 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  

5. At 1050 you fix your position 237°T, 2.5 nm from Tern Island tower. You steer 332°T at 5.1 kn until 1110, then 172°T at 7.5 kn until 1125.

   Give the 1125 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  

6. At 1510 you fix your position 073°T, 2.0 nm from Tern Island tower. You steer 163°T at 7.3 kn until 1545, then 245°T at 8.5 kn until 1600.

   Give the 1600 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 1420 you fix your position 304°T, 2.2 nm from Tern Island tower. You steer 286°T at 5.4 kn until 1450, then 157°T at 6.7 kn until 1530.

   Give the 1530 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 1050 you fix your position 049°T, 2.1 nm from Heron Point Light. You steer 052°T at 4.1 kn until 1105, then 309°T at 5.5 kn until 1135.

   Give the 1135 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