Worksheet 517 · Skill 5

Set and drift

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1. At 1330 your fix is 218°T, 2.4 nm from Tern Island tower. You steer 317°T at 5.7 kn through the water. At 1415 a new fix puts you 058°T, 3.7 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0845 your fix is 248°T, 2.5 nm from Gannet Rock daybeacon. You steer 304°T at 5.7 kn through the water. At 1000 a new fix puts you 055°T, 4.0 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1520 your fix is 053°T, 1.2 nm from Heron Point Light. You steer 346°T at 5.8 kn through the water. At 1620 a new fix puts you 058°T, 3.8 nm from Westfield church spire.

   Plot the 1620 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 0945 your fix is 000°T, 1.4 nm from Gannet Rock daybeacon. You steer 243°T at 7.2 kn through the water. At 1040 a new fix puts you 038°T, 2.0 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1050 your fix is 043°T, 3.6 nm from Westfield church spire. You steer 148°T at 5.7 kn through the water. At 1120 a new fix puts you 250°T, 3.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0840 your fix is 280°T, 1.7 nm from Gannet Rock daybeacon. You steer 275°T at 4.8 kn through the water. At 0910 a new fix puts you 048°T, 3.3 nm from Heron Point Light.

   Plot the 0910 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 0735 your fix is 044°T, 2.0 nm from Westfield church spire. You steer 150°T at 5.9 kn through the water. At 0805 a new fix puts you 097°T, 2.9 nm from Westfield church spire.

   Plot the 0805 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 1000 your fix is 049°T, 1.0 nm from Westfield church spire. You steer 148°T at 6.8 kn through the water. At 1030 a new fix puts you 006°T, 1.3 nm from Heron Point Light.

   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