Worksheet 57 · Skill 5

Set and drift

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1. At 1445 your fix is 090°T, 1.9 nm from Westfield church spire. You steer 018°T at 4.9 kn through the water. At 1515 a new fix puts you 037°T, 2.6 nm from Westfield church spire.

   Plot the 1515 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  

2. At 0845 your fix is 047°T, 3.5 nm from Westfield church spire. You steer 077°T at 5.8 kn through the water. At 0920 a new fix puts you 315°T, 3.2 nm from Tern Island tower.

   Plot the 0920 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 0830 your fix is 262°T, 3.2 nm from Tern Island tower. You steer 219°T at 4.5 kn through the water. At 0900 a new fix puts you 014°T, 1.6 nm from Heron Point Light.

   Plot the 0900 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  

4. At 0840 your fix is 305°T, 3.6 nm from Mill stack. You steer 353°T at 8.0 kn through the water. At 0915 a new fix puts you 028°T, 2.0 nm from Westfield church spire.

   Plot the 0915 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  

5. At 0815 your fix is 292°T, 3.7 nm from Tern Island tower. You steer 188°T at 4.1 kn through the water. At 0930 a new fix puts you 022°T, 1.4 nm from Heron Point Light.

   Plot the 0930 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  

6. At 1505 your fix is 046°T, 3.0 nm from Westfield church spire. You steer 172°T at 4.3 kn through the water. At 1555 a new fix puts you 087°T, 1.2 nm from Westfield church spire.

   Plot the 1555 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  

7. At 1550 your fix is 196°T, 1.1 nm from Gannet Rock daybeacon. You steer 304°T at 4.4 kn through the water. At 1715 a new fix puts you 294°T, 4.1 nm from Tern Island tower.

   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  

8. At 0730 your fix is 048°T, 1.8 nm from Westfield church spire. You steer 075°T at 6.9 kn through the water. At 0840 a new fix puts you 028°T, 2.7 nm from Tern Island tower.

   Plot the 0840 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn