Worksheet 536 · Skill 3

Dead reckoning

Print this worksheet Next sheet

Plot Pass worksheet. Plot Pass $1.95/month or $19.50/year · Free during preview. Plotroom · cedarpointmarina.net · invented chart, not for navigation.

1. At 0950 you fix your position 281°T, 1.5 nm from Tern Island tower. You steer 265°T at 4.5 kn until 1000, then 178°T at 4.8 kn until 1010.

   Give the 1010 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 0730 you fix your position 241°T, 3.2 nm from Tern Island tower. You steer 029°T at 5.9 kn until 0815, then 125°T at 6.0 kn until 0835.

   Give the 0835 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 1120 you fix your position 345°T, 2.4 nm from Tern Island tower. You steer 160°T at 7.3 kn until 1130, then 099°T at 4.7 kn until 1200.

   Give the 1200 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 1005 you fix your position 091°T, 1.6 nm from Gannet Rock daybeacon. You steer 233°T at 5.6 kn until 1040, then 288°T at 9.2 kn until 1105.

   Give the 1105 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

5. At 1125 you fix your position 268°T, 2.6 nm from Tern Island tower. You steer 208°T at 7.2 kn until 1200, then 355°T at 4.3 kn until 1230.

   Give the 1230 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 0810 you fix your position 076°T, 2.3 nm from Tern Island tower. You steer 321°T at 4.9 kn until 0830, then 161°T at 8.8 kn until 0840.

   Give the 0840 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 1250 you fix your position 236°T, 1.5 nm from Tern Island tower. You steer 164°T at 4.1 kn until 1300, then 257°T at 5.4 kn until 1325.

   Give the 1325 DR position as the true bearing FROM Heron Point Light 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 Heron Point Light: ________ °T   Distance: ________ nm  

8. At 0755 you fix your position 247°T, 3.1 nm from Tern Island tower. You steer 130°T at 5.4 kn until 0830, then 337°T at 7.6 kn until 0845.

   Give the 0845 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