Worksheet 691 · Skill 5

Set and drift

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1. At 0945 your fix is 076°T, 1.0 nm from Heron Point Light. You steer 350°T at 5.3 kn through the water. At 1020 a new fix puts you 072°T, 2.8 nm from Westfield church spire.

   Plot the 1020 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 1520 your fix is 045°T, 1.0 nm from Heron Point Light. You steer 003°T at 4.8 kn through the water. At 1605 a new fix puts you 079°T, 2.5 nm from Westfield church spire.

   Plot the 1605 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  

3. At 0735 your fix is 035°T, 2.9 nm from Westfield church spire. You steer 166°T at 5.3 kn through the water. At 0825 a new fix puts you 055°T, 1.7 nm from Heron Point Light.

   Plot the 0825 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  

4. At 1555 your fix is 108°T, 2.3 nm from Westfield church spire. You steer 355°T at 5.0 kn through the water. At 1635 a new fix puts you 029°T, 3.4 nm from Westfield church spire.

   Plot the 1635 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  

5. At 1200 your fix is 051°T, 2.4 nm from Heron Point Light. You steer 336°T at 4.6 kn through the water. At 1235 a new fix puts you 067°T, 3.1 nm from Westfield church spire.

   Plot the 1235 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 1540 your fix is 218°T, 2.1 nm from Tern Island tower. You steer 303°T at 5.6 kn through the water. At 1615 a new fix puts you 272°T, 2.6 nm from Tern Island tower.

   Plot the 1615 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  

7. At 1105 your fix is 052°T, 4.1 nm from Westfield church spire. You steer 076°T at 5.5 kn through the water. At 1135 a new fix puts you 316°T, 2.1 nm from Tern Island tower.

   Plot the 1135 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 1020 your fix is 308°T, 3.0 nm from Tern Island tower. You steer 159°T at 7.1 kn through the water. At 1100 a new fix puts you 257°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1100 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