Worksheet 100 · Skill 3

Dead reckoning

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1. At 1155 you fix your position 121°T, 2.2 nm from Westfield church spire. You steer 076°T at 6.6 kn until 1225, then 032°T at 6.1 kn until 1235.

   Give the 1235 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 0710 you fix your position 056°T, 3.1 nm from Gannet Rock daybeacon. You steer 166°T at 6.4 kn until 0730, then 339°T at 8.2 kn until 0810.

   Give the 0810 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 1550 you fix your position 066°T, 4.1 nm from Tern Island tower. You steer 234°T at 6.4 kn until 1615, then 322°T at 7.3 kn until 1635.

   Give the 1635 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 0945 you fix your position 026°T, 2.7 nm from Gannet Rock daybeacon. You steer 032°T at 9.5 kn until 1000, then 263°T at 5.4 kn until 1030.

   Give the 1030 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 1305 you fix your position 000°T, 1.4 nm from Tern Island tower. You steer 262°T at 8.2 kn until 1335, then 083°T at 8.2 kn until 1410.

   Give the 1410 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 1315 you fix your position 024°T, 3.3 nm from Westfield church spire. You steer 164°T at 9.8 kn until 1355, then 068°T at 4.3 kn until 1420.

   Give the 1420 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  

7. At 1135 you fix your position 288°T, 2.4 nm from Tern Island tower. You steer 268°T at 6.2 kn until 1145, then 079°T at 5.3 kn until 1230.

   Give the 1230 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 1055 you fix your position 087°T, 3.2 nm from Westfield church spire. You steer 127°T at 7.3 kn until 1140, then 327°T at 7.3 kn until 1205.

   Give the 1205 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