Worksheet 503 · Skill 5

Set and drift

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1. At 0815 your fix is 259°T, 1.5 nm from Gannet Rock daybeacon. You steer 038°T at 7.2 kn through the water. At 0850 a new fix puts you 035°T, 2.2 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1525 your fix is 016°T, 2.1 nm from Westfield church spire. You steer 131°T at 5.9 kn through the water. At 1630 a new fix puts you 220°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1630 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 0945 your fix is 040°T, 4.2 nm from Westfield church spire. You steer 171°T at 8.1 kn through the water. At 1025 a new fix puts you 049°T, 2.9 nm from Heron Point Light.

   Plot the 1025 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 1145 your fix is 155°T, 3.2 nm from Tern Island tower. You steer 275°T at 5.2 kn through the water. At 1250 a new fix puts you 344°T, 2.7 nm from Mill stack.

   Plot the 1250 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  

5. At 1000 your fix is 306°T, 1.5 nm from Tern Island tower. You steer 244°T at 4.6 kn through the water. At 1030 a new fix puts you 077°T, 3.0 nm from Westfield church spire.

   Plot the 1030 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 0740 your fix is 084°T, 2.8 nm from Gannet Rock daybeacon. You steer 248°T at 4.5 kn through the water. At 0810 a new fix puts you 177°T, 1.4 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1005 your fix is 037°T, 3.7 nm from Westfield church spire. You steer 142°T at 8.2 kn through the water. At 1045 a new fix puts you 041°T, 3.3 nm from Heron Point Light.

   Plot the 1045 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  

8. At 1435 your fix is 054°T, 2.0 nm from Westfield church spire. You steer 102°T at 5.2 kn through the water. At 1520 a new fix puts you 254°T, 2.5 nm from Tern Island tower.

   Plot the 1520 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn