Worksheet 864 · Skill 5

Set and drift

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1. At 0745 your fix is 058°T, 3.1 nm from Tern Island tower. You steer 197°T at 6.7 kn through the water. At 0820 a new fix puts you 304°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 0820 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  

2. At 0935 your fix is 019°T, 1.5 nm from Tern Island tower. You steer 279°T at 4.8 kn through the water. At 1010 a new fix puts you 316°T, 2.0 nm from Tern Island tower.

   Plot the 1010 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  

3. At 0910 your fix is 045°T, 2.8 nm from Gannet Rock daybeacon. You steer 322°T at 4.6 kn through the water. At 0945 a new fix puts you 055°T, 2.2 nm from Tern Island tower.

   Plot the 0945 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  

4. At 1555 your fix is 345°T, 2.4 nm from Mill stack. You steer 008°T at 6.5 kn through the water. At 1650 a new fix puts you 335°T, 2.1 nm from Tern Island tower.

   Plot the 1650 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1425 your fix is 075°T, 3.5 nm from Westfield church spire. You steer 315°T at 7.2 kn through the water. At 1455 a new fix puts you 017°T, 2.4 nm from Westfield church spire.

   Plot the 1455 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  

6. At 1020 your fix is 245°T, 2.4 nm from Gannet Rock daybeacon. You steer 054°T at 7.2 kn through the water. At 1050 a new fix puts you 103°T, 2.0 nm from Tern Island tower.

   Plot the 1050 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  

7. At 1035 your fix is 052°T, 3.5 nm from Tern Island tower. You steer 169°T at 6.1 kn through the water. At 1105 a new fix puts you 045°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1105 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  

8. At 1340 your fix is 357°T, 2.9 nm from Mill stack. You steer 069°T at 4.9 kn through the water. At 1415 a new fix puts you 325°T, 2.7 nm from Kittle water tank.

   Plot the 1415 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