Worksheet 575 · Skill 3

Dead reckoning

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1. At 1230 you fix your position 236°T, 2.2 nm from Tern Island tower. You steer 098°T at 8.5 kn until 1240, then 266°T at 5.8 kn until 1255.

   Give the 1255 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 1030 you fix your position 349°T, 2.2 nm from Mill stack. You steer 283°T at 7.4 kn until 1055, then 001°T at 7.0 kn until 1125.

   Give the 1125 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  

3. At 1245 you fix your position 060°T, 3.1 nm from Gannet Rock daybeacon. You steer 168°T at 7.0 kn until 1255, then 355°T at 9.1 kn until 1325.

   Give the 1325 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 1330 you fix your position 088°T, 2.4 nm from Westfield church spire. You steer 018°T at 6.4 kn until 1355, then 262°T at 4.1 kn until 1420.

   Give the 1420 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 1215 you fix your position 141°T, 2.5 nm from Tern Island tower. You steer 028°T at 6.2 kn until 1225, then 171°T at 5.4 kn until 1240.

   Give the 1240 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  

6. At 1225 you fix your position 294°T, 3.4 nm from Tern Island tower. You steer 196°T at 7.7 kn until 1300, then 035°T at 8.0 kn until 1325.

   Give the 1325 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 1320 you fix your position 355°T, 2.2 nm from Mill stack. You steer 292°T at 7.1 kn until 1345, then 041°T at 4.2 kn until 1400.

   Give the 1400 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 0955 you fix your position 038°T, 2.7 nm from Gannet Rock daybeacon. You steer 267°T at 7.5 kn until 1005, then 006°T at 5.0 kn until 1015.

   Give the 1015 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