Worksheet 217 · Skill 3

Dead reckoning

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1. At 1135 you fix your position 105°T, 2.3 nm from Gannet Rock daybeacon. You steer 266°T at 9.3 kn until 1200, then 230°T at 8.6 kn until 1215.

   Give the 1215 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  

2. At 1400 you fix your position 352°T, 3.1 nm from Mill stack. You steer 053°T at 6.1 kn until 1415, then 190°T at 5.8 kn until 1430.

   Give the 1430 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  

3. At 0920 you fix your position 229°T, 3.1 nm from Tern Island tower. You steer 240°T at 5.9 kn until 0940, then 021°T at 6.5 kn until 1000.

   Give the 1000 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 1235 you fix your position 110°T, 1.1 nm from Westfield church spire. You steer 155°T at 8.0 kn until 1255, then 087°T at 7.3 kn until 1320.

   Give the 1320 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  

5. At 1025 you fix your position 064°T, 2.5 nm from Heron Point Light. You steer 124°T at 7.7 kn until 1035, then 064°T at 5.0 kn until 1050.

   Give the 1050 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 1410 you fix your position 306°T, 2.3 nm from Tern Island tower. You steer 192°T at 8.8 kn until 1435, then 281°T at 5.4 kn until 1505.

   Give the 1505 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 1330 you fix your position 059°T, 4.6 nm from Tern Island tower. You steer 188°T at 8.5 kn until 1400, then 284°T at 6.8 kn until 1425.

   Give the 1425 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 0945 you fix your position 040°T, 1.9 nm from Gannet Rock daybeacon. You steer 005°T at 5.6 kn until 1005, then 035°T at 5.6 kn until 1020.

   Give the 1020 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