Worksheet 239 · 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 0700 you fix your position 073°T, 1.2 nm from Westfield church spire. You steer 064°T at 4.3 kn until 0715, then 143°T at 7.6 kn until 0740.

   Give the 0740 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  

2. At 1110 you fix your position 354°T, 3.1 nm from Mill stack. You steer 081°T at 4.5 kn until 1125, then 241°T at 6.6 kn until 1150.

   Give the 1150 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  

3. At 1105 you fix your position 099°T, 3.1 nm from Westfield church spire. You steer 150°T at 9.0 kn until 1130, then 318°T at 9.2 kn until 1145.

   Give the 1145 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  

4. At 1405 you fix your position 044°T, 3.9 nm from Gannet Rock daybeacon. You steer 203°T at 7.8 kn until 1430, then 295°T at 6.3 kn until 1440.

   Give the 1440 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 1600 you fix your position 291°T, 4.0 nm from Tern Island tower. You steer 140°T at 6.6 kn until 1640, then 055°T at 5.2 kn until 1655.

   Give the 1655 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 0910 you fix your position 266°T, 2.6 nm from Gannet Rock daybeacon. You steer 285°T at 6.3 kn until 0955, then 065°T at 6.6 kn until 1020.

   Give the 1020 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 1005 you fix your position 047°T, 1.5 nm from Kittle water tank. You steer 342°T at 8.8 kn until 1050, then 199°T at 6.8 kn until 1115.

   Give the 1115 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 1120 you fix your position 220°T, 3.3 nm from Tern Island tower. You steer 273°T at 7.1 kn until 1145, then 316°T at 4.9 kn until 1210.

   Give the 1210 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