Worksheet 421 · Skill 3

Dead reckoning

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1. At 1410 you fix your position 031°T, 2.6 nm from Kittle water tank. You steer 015°T at 5.5 kn until 1425, then 204°T at 4.0 kn until 1510.

   Give the 1510 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  

2. At 1255 you fix your position 053°T, 2.4 nm from Gannet Rock daybeacon. You steer 190°T at 6.8 kn until 1310, then 260°T at 4.1 kn until 1355.

   Give the 1355 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  

3. At 1010 you fix your position 085°T, 3.7 nm from Westfield church spire. You steer 053°T at 4.9 kn until 1055, then 090°T at 8.0 kn until 1110.

   Give the 1110 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 1125 you fix your position 359°T, 1.7 nm from Kittle water tank. You steer 327°T at 4.5 kn until 1200, then 144°T at 7.4 kn until 1215.

   Give the 1215 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 1200 you fix your position 056°T, 3.0 nm from Heron Point Light. You steer 047°T at 4.2 kn until 1230, then 151°T at 7.6 kn until 1300.

   Give the 1300 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 1225 you fix your position 248°T, 3.1 nm from Tern Island tower. You steer 235°T at 5.8 kn until 1235, then 100°T at 9.7 kn until 1300.

   Give the 1300 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 1250 you fix your position 009°T, 1.2 nm from Gannet Rock daybeacon. You steer 008°T at 5.9 kn until 1325, then 170°T at 7.8 kn until 1410.

   Give the 1410 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  

8. At 0930 you fix your position 016°T, 2.4 nm from Mill stack. You steer 093°T at 8.6 kn until 0940, then 012°T at 9.7 kn until 1000.

   Give the 1000 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