Worksheet 492 · Skill 3

Dead reckoning

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1. At 1230 you fix your position 275°T, 3.5 nm from Tern Island tower. You steer 078°T at 9.6 kn until 1245, then 341°T at 5.6 kn until 1300.

   Give the 1300 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 1155 you fix your position 229°T, 1.3 nm from Tern Island tower. You steer 187°T at 7.4 kn until 1205, then 320°T at 5.9 kn until 1250.

   Give the 1250 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 1140 you fix your position 071°T, 4.1 nm from Tern Island tower. You steer 166°T at 9.5 kn until 1205, then 245°T at 6.5 kn until 1240.

   Give the 1240 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 0700 you fix your position 233°T, 2.7 nm from Tern Island tower. You steer 244°T at 5.5 kn until 0740, then 079°T at 9.5 kn until 0805.

   Give the 0805 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 0725 you fix your position 048°T, 4.3 nm from Westfield church spire. You steer 240°T at 6.4 kn until 0800, then 090°T at 6.1 kn until 0830.

   Give the 0830 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 0910 you fix your position 045°T, 2.5 nm from Gannet Rock daybeacon. You steer 263°T at 9.3 kn until 0925, then 176°T at 5.8 kn until 0940.

   Give the 0940 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 1305 you fix your position 037°T, 3.3 nm from Gannet Rock daybeacon. You steer 293°T at 6.4 kn until 1325, then 070°T at 4.0 kn until 1335.

   Give the 1335 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 1405 you fix your position 053°T, 3.6 nm from Westfield church spire. You steer 181°T at 8.2 kn until 1435, then 139°T at 4.8 kn until 1515.

   Give the 1515 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