Worksheet 352 · Skill 3

Dead reckoning

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1. At 1325 you fix your position 059°T, 2.0 nm from Heron Point Light. You steer 048°T at 4.5 kn until 1345, then 198°T at 4.0 kn until 1355.

   Give the 1355 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  

2. At 0800 you fix your position 026°T, 2.7 nm from Mill stack. You steer 010°T at 5.9 kn until 0825, then 303°T at 7.2 kn until 0835.

   Give the 0835 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 0735 you fix your position 037°T, 2.9 nm from Westfield church spire. You steer 035°T at 4.4 kn until 0755, then 261°T at 7.1 kn until 0815.

   Give the 0815 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 1140 you fix your position 270°T, 2.5 nm from Tern Island tower. You steer 186°T at 6.6 kn until 1205, then 032°T at 7.8 kn until 1215.

   Give the 1215 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  

5. At 1210 you fix your position 346°T, 1.5 nm from Tern Island tower. You steer 261°T at 6.9 kn until 1255, then 028°T at 4.6 kn until 1320.

   Give the 1320 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 1235 you fix your position 215°T, 1.5 nm from Gannet Rock daybeacon. You steer 325°T at 6.2 kn until 1310, then 171°T at 6.4 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 0935 you fix your position 261°T, 2.6 nm from Gannet Rock daybeacon. You steer 003°T at 8.6 kn until 0945, then 227°T at 4.4 kn until 1010.

   Give the 1010 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 0950 you fix your position 249°T, 3.7 nm from Tern Island tower. You steer 152°T at 4.3 kn until 1000, then 243°T at 9.5 kn until 1010.

   Give the 1010 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