Worksheet 636 · 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 1025 you fix your position 218°T, 3.2 nm from Tern Island tower. You steer 096°T at 5.0 kn until 1105, then 242°T at 6.4 kn until 1125.

   Give the 1125 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  

2. At 0705 you fix your position 219°T, 3.0 nm from Tern Island tower. You steer 302°T at 8.0 kn until 0730, then 079°T at 9.2 kn until 0750.

   Give the 0750 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 1145 you fix your position 048°T, 4.4 nm from Westfield church spire. You steer 182°T at 5.8 kn until 1155, then 336°T at 5.6 kn until 1215.

   Give the 1215 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  

4. At 0720 you fix your position 107°T, 1.5 nm from Westfield church spire. You steer 070°T at 6.7 kn until 0745, then 246°T at 7.1 kn until 0815.

   Give the 0815 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 1525 you fix your position 044°T, 3.3 nm from Westfield church spire. You steer 001°T at 5.0 kn until 1535, then 264°T at 4.0 kn until 1605.

   Give the 1605 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 1440 you fix your position 032°T, 3.5 nm from Westfield church spire. You steer 152°T at 6.5 kn until 1510, then 321°T at 5.7 kn until 1540.

   Give the 1540 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 1515 you fix your position 266°T, 2.7 nm from Gannet Rock daybeacon. You steer 056°T at 5.9 kn until 1600, then 239°T at 8.4 kn until 1620.

   Give the 1620 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  

8. At 0750 you fix your position 128°T, 1.0 nm from Gannet Rock daybeacon. You steer 017°T at 4.6 kn until 0825, then 300°T at 7.9 kn until 0850.

   Give the 0850 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