Worksheet 520 · 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 1545 you fix your position 267°T, 1.5 nm from Tern Island tower. You steer 197°T at 7.8 kn until 1625, then 046°T at 6.2 kn until 1700.

   Give the 1700 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  

2. At 0920 you fix your position 016°T, 2.0 nm from Gannet Rock daybeacon. You steer 226°T at 5.4 kn until 0945, then 261°T at 4.0 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  

3. At 1035 you fix your position 073°T, 3.1 nm from Westfield church spire. You steer 068°T at 6.7 kn until 1045, then 142°T at 6.3 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  

4. At 0840 you fix your position 052°T, 3.1 nm from Tern Island tower. You steer 224°T at 4.7 kn until 0850, then 190°T at 7.2 kn until 0900.

   Give the 0900 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 1120 you fix your position 131°T, 0.9 nm from Gannet Rock daybeacon. You steer 114°T at 8.0 kn until 1135, then 265°T at 7.4 kn until 1155.

   Give the 1155 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  

6. At 1040 you fix your position 311°T, 1.8 nm from Kittle water tank. You steer 029°T at 8.9 kn until 1110, then 133°T at 8.9 kn until 1120.

   Give the 1120 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  

7. At 0705 you fix your position 056°T, 2.8 nm from Tern Island tower. You steer 345°T at 6.3 kn until 0715, then 243°T at 7.3 kn until 0745.

   Give the 0745 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 0745 you fix your position 153°T, 1.4 nm from Tern Island tower. You steer 228°T at 6.4 kn until 0825, then 101°T at 7.4 kn until 0835.

   Give the 0835 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