Worksheet 95 · Skill 3

Dead reckoning

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1. At 1235 you fix your position 062°T, 3.0 nm from Westfield church spire. You steer 143°T at 6.3 kn until 1250, then 099°T at 8.6 kn until 1330.

   Give the 1330 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 1045 you fix your position 075°T, 2.7 nm from Gannet Rock daybeacon. You steer 348°T at 4.0 kn until 1110, then 212°T at 6.7 kn until 1135.

   Give the 1135 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm  

3. At 1015 you fix your position 281°T, 1.7 nm from Tern Island tower. You steer 231°T at 7.1 kn until 1045, then 109°T at 8.4 kn until 1115.

   Give the 1115 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  

4. At 0820 you fix your position 089°T, 3.1 nm from Westfield church spire. You steer 095°T at 6.7 kn until 0835, then 163°T at 4.8 kn until 0910.

   Give the 0910 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 1205 you fix your position 046°T, 2.0 nm from Heron Point Light. You steer 091°T at 7.4 kn until 1245, then 026°T at 5.4 kn until 1330.

   Give the 1330 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 0915 you fix your position 295°T, 4.0 nm from Tern Island tower. You steer 157°T at 9.2 kn until 0945, then 325°T at 6.3 kn until 1025.

   Give the 1025 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 1420 you fix your position 313°T, 3.5 nm from Tern Island tower. You steer 111°T at 9.2 kn until 1445, then 040°T at 4.3 kn until 1505.

   Give the 1505 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 1015 you fix your position 233°T, 1.8 nm from Gannet Rock daybeacon. You steer 006°T at 7.8 kn until 1030, then 251°T at 7.5 kn until 1040.

   Give the 1040 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