Worksheet 365 · Skill 5

Set and drift

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1. At 0935 your fix is 024°T, 3.1 nm from Westfield church spire. You steer 145°T at 4.4 kn through the water. At 1010 a new fix puts you 260°T, 3.2 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  

2. At 1550 your fix is 244°T, 2.7 nm from Tern Island tower. You steer 092°T at 4.6 kn through the water. At 1715 a new fix puts you 180°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1715 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0710 your fix is 295°T, 3.9 nm from Tern Island tower. You steer 156°T at 6.6 kn through the water. At 0810 a new fix puts you 002°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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0930 your fix is 037°T, 1.5 nm from Tern Island tower. You steer 302°T at 4.5 kn through the water. At 1000 a new fix puts you 316°T, 2.2 nm from Tern Island tower.

   Plot the 1000 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 1105 your fix is 273°T, 3.5 nm from Tern Island tower. You steer 271°T at 5.0 kn through the water. At 1140 a new fix puts you 051°T, 2.1 nm from Westfield church spire.

   Plot the 1140 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 1515 your fix is 082°T, 1.9 nm from Gannet Rock daybeacon. You steer 338°T at 5.0 kn through the water. At 1545 a new fix puts you 082°T, 1.9 nm from Tern Island tower.

   Plot the 1545 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 0925 your fix is 205°T, 1.9 nm from Gannet Rock daybeacon. You steer 322°T at 4.9 kn through the water. At 0955 a new fix puts you 214°T, 1.7 nm from Tern Island tower.

   Plot the 0955 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 1420 your fix is 038°T, 1.7 nm from Gannet Rock daybeacon. You steer 251°T at 7.0 kn through the water. At 1450 a new fix puts you 259°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1450 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