Worksheet 29 · Skill 3

Dead reckoning

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1. At 1230 you fix your position 308°T, 1.5 nm from Tern Island tower. You steer 273°T at 8.6 kn until 1240, then 075°T at 9.5 kn until 1305.

   Give the 1305 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 0905 you fix your position 333°T, 2.6 nm from Tern Island tower. You steer 187°T at 9.6 kn until 0930, then 325°T at 6.0 kn until 0955.

   Give the 0955 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 1105 you fix your position 057°T, 4.2 nm from Tern Island tower. You steer 244°T at 4.9 kn until 1125, then 085°T at 6.8 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  

4. At 0830 you fix your position 089°T, 1.7 nm from Westfield church spire. You steer 324°T at 7.6 kn until 0850, then 122°T at 6.1 kn until 0915.

   Give the 0915 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  

5. At 1220 you fix your position 012°T, 2.9 nm from Mill stack. You steer 153°T at 4.9 kn until 1230, then 255°T at 6.2 kn until 1240.

   Give the 1240 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 1245 you fix your position 357°T, 1.6 nm from Heron Point Light. You steer 018°T at 5.9 kn until 1310, then 303°T at 4.4 kn until 1330.

   Give the 1330 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 1100 you fix your position 051°T, 3.4 nm from Westfield church spire. You steer 227°T at 8.8 kn until 1110, then 359°T at 9.5 kn until 1120.

   Give the 1120 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  

8. At 1325 you fix your position 018°T, 2.0 nm from Kittle water tank. You steer 266°T at 9.4 kn until 1355, then 065°T at 4.3 kn until 1425.

   Give the 1425 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