Worksheet 428 · 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 1005 you fix your position 238°T, 3.5 nm from Tern Island tower. You steer 328°T at 6.5 kn until 1025, then 013°T at 4.1 kn until 1100.

   Give the 1100 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 1100 you fix your position 031°T, 1.9 nm from Heron Point Light. You steer 120°T at 4.6 kn until 1115, then 164°T at 5.9 kn until 1125.

   Give the 1125 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 1205 you fix your position 019°T, 2.0 nm from Gannet Rock daybeacon. You steer 239°T at 4.9 kn until 1225, then 047°T at 5.0 kn until 1250.

   Give the 1250 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 1430 you fix your position 252°T, 3.3 nm from Tern Island tower. You steer 175°T at 5.7 kn until 1450, then 070°T at 5.7 kn until 1510.

   Give the 1510 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 1205 you fix your position 001°T, 2.2 nm from Mill stack. You steer 109°T at 4.1 kn until 1215, then 330°T at 5.7 kn until 1245.

   Give the 1245 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 1515 you fix your position 309°T, 1.7 nm from Tern Island tower. You steer 067°T at 4.5 kn until 1540, then 128°T at 7.0 kn until 1550.

   Give the 1550 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 1350 you fix your position 054°T, 3.2 nm from Heron Point Light. You steer 113°T at 4.6 kn until 1425, then 165°T at 5.2 kn until 1440.

   Give the 1440 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  

8. At 1135 you fix your position 078°T, 2.3 nm from Gannet Rock daybeacon. You steer 275°T at 5.5 kn until 1220, then 167°T at 8.7 kn until 1245.

   Give the 1245 DR position as the true bearing FROM Kittle water tank 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 Kittle water tank: ________ °T   Distance: ________ nm