Worksheet 57 · Skill 3

Dead reckoning

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1. At 1035 you fix your position 226°T, 2.2 nm from Tern Island tower. You steer 300°T at 8.0 kn until 1115, then 122°T at 9.2 kn until 1140.

   Give the 1140 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 0735 you fix your position 216°T, 2.9 nm from Tern Island tower. You steer 211°T at 4.3 kn until 0755, then 176°T at 6.9 kn until 0805.

   Give the 0805 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 1335 you fix your position 046°T, 2.3 nm from Tern Island tower. You steer 254°T at 7.6 kn until 1410, then 299°T at 5.3 kn until 1430.

   Give the 1430 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 0900 you fix your position 141°T, 2.4 nm from Tern Island tower. You steer 091°T at 8.9 kn until 0920, then 247°T at 5.1 kn until 1000.

   Give the 1000 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  

5. At 0705 you fix your position 017°T, 3.7 nm from Westfield church spire. You steer 202°T at 4.9 kn until 0735, then 051°T at 6.4 kn until 0745.

   Give the 0745 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 1420 you fix your position 079°T, 2.8 nm from Tern Island tower. You steer 309°T at 5.6 kn until 1450, then 276°T at 4.9 kn until 1510.

   Give the 1510 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 1235 you fix your position 052°T, 2.8 nm from Gannet Rock daybeacon. You steer 318°T at 4.1 kn until 1255, then 149°T at 5.8 kn until 1330.

   Give the 1330 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  

8. At 1510 you fix your position 020°T, 2.1 nm from Kittle water tank. You steer 341°T at 6.3 kn until 1555, then 273°T at 4.3 kn until 1630.

   Give the 1630 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