Worksheet 630 · Skill 5

Set and drift

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1. At 0720 your fix is 002°T, 0.9 nm from Kittle water tank. You steer 280°T at 5.7 kn through the water. At 0810 a new fix puts you 346°T, 1.4 nm from Mill stack.

   Plot the 0810 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0935 your fix is 257°T, 2.8 nm from Gannet Rock daybeacon. You steer 301°T at 5.7 kn through the water. At 1040 a new fix puts you 063°T, 1.9 nm from Westfield church spire.

   Plot the 1040 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1050 your fix is 036°T, 2.5 nm from Tern Island tower. You steer 103°T at 5.4 kn through the water. At 1130 a new fix puts you 073°T, 4.6 nm from Tern Island tower.

   Plot the 1130 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0730 your fix is 012°T, 0.9 nm from Gannet Rock daybeacon. You steer 029°T at 7.5 kn through the water. At 0800 a new fix puts you 031°T, 3.8 nm from Gannet Rock daybeacon.

   Plot the 0800 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1045 your fix is 080°T, 1.1 nm from Gannet Rock daybeacon. You steer 012°T at 4.1 kn through the water. At 1120 a new fix puts you 053°T, 3.7 nm from Gannet Rock daybeacon.

   Plot the 1120 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0810 your fix is 319°T, 1.7 nm from Tern Island tower. You steer 237°T at 4.3 kn through the water. At 0850 a new fix puts you 268°T, 2.7 nm from Tern Island tower.

   Plot the 0850 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0930 your fix is 045°T, 1.6 nm from Kittle water tank. You steer 003°T at 4.9 kn through the water. At 1005 a new fix puts you 057°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1005 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1345 your fix is 003°T, 2.0 nm from Mill stack. You steer 106°T at 4.7 kn through the water. At 1420 a new fix puts you 205°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1420 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn