Worksheet 159 · Skill 3

Dead reckoning

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1. At 1010 you fix your position 042°T, 3.2 nm from Heron Point Light. You steer 109°T at 7.8 kn until 1020, then 040°T at 5.2 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  

2. At 1520 you fix your position 222°T, 1.4 nm from Gannet Rock daybeacon. You steer 302°T at 8.4 kn until 1600, then 239°T at 9.0 kn until 1615.

   Give the 1615 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  

3. At 0730 you fix your position 172°T, 1.2 nm from Tern Island tower. You steer 126°T at 4.9 kn until 0740, then 205°T at 4.2 kn until 0805.

   Give the 0805 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 1000 you fix your position 031°T, 2.7 nm from Tern Island tower. You steer 146°T at 8.9 kn until 1025, then 321°T at 4.2 kn until 1105.

   Give the 1105 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 0905 you fix your position 007°T, 2.4 nm from Mill stack. You steer 004°T at 5.4 kn until 0925, then 153°T at 5.5 kn until 0955.

   Give the 0955 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 1125 you fix your position 077°T, 3.9 nm from Tern Island tower. You steer 238°T at 8.4 kn until 1155, then 281°T at 9.9 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  

7. At 1530 you fix your position 052°T, 1.1 nm from Westfield church spire. You steer 131°T at 6.4 kn until 1615, then 051°T at 4.6 kn until 1625.

   Give the 1625 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  

8. At 1045 you fix your position 074°T, 2.4 nm from Heron Point Light. You steer 072°T at 5.1 kn until 1130, then 133°T at 10.0 kn until 1145.

   Give the 1145 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