Worksheet 764 · Skill 3

Dead reckoning

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1. At 1515 you fix your position 055°T, 1.7 nm from Westfield church spire. You steer 085°T at 9.2 kn until 1540, then 018°T at 4.9 kn until 1610.

   Give the 1610 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 1040 you fix your position 241°T, 2.2 nm from Tern Island tower. You steer 282°T at 6.5 kn until 1115, then 021°T at 7.8 kn until 1135.

   Give the 1135 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 1515 you fix your position 054°T, 1.7 nm from Kittle water tank. You steer 005°T at 4.9 kn until 1550, then 270°T at 8.3 kn until 1630.

   Give the 1630 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 1320 you fix your position 106°T, 1.8 nm from Gannet Rock daybeacon. You steer 005°T at 8.9 kn until 1330, then 174°T at 8.7 kn until 1340.

   Give the 1340 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  

5. At 1430 you fix your position 055°T, 2.0 nm from Gannet Rock daybeacon. You steer 337°T at 8.0 kn until 1500, then 169°T at 6.8 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  

6. At 1005 you fix your position 335°T, 2.2 nm from Mill stack. You steer 092°T at 8.0 kn until 1045, then 280°T at 6.0 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  

7. At 0920 you fix your position 004°T, 1.5 nm from Gannet Rock daybeacon. You steer 205°T at 7.2 kn until 0940, then 262°T at 8.6 kn until 1020.

   Give the 1020 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 1350 you fix your position 216°T, 1.4 nm from Gannet Rock daybeacon. You steer 281°T at 5.6 kn until 1415, then 070°T at 8.7 kn until 1435.

   Give the 1435 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