Worksheet 578 · Skill 5

Set and drift

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1. At 1250 your fix is 042°T, 3.6 nm from Westfield church spire. You steer 141°T at 8.2 kn through the water. At 1340 a new fix puts you 274°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1340 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  

2. At 1440 your fix is 063°T, 2.1 nm from Tern Island tower. You steer 169°T at 4.6 kn through the water. At 1515 a new fix puts you 346°T, 3.1 nm from Kittle water tank.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1600 your fix is 100°T, 2.6 nm from Westfield church spire. You steer 024°T at 5.3 kn through the water. At 1635 a new fix puts you 280°T, 3.0 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0700 your fix is 021°T, 2.6 nm from Tern Island tower. You steer 103°T at 5.0 kn through the water. At 0735 a new fix puts you 071°T, 3.7 nm from Tern Island tower.

   Plot the 0735 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 1355 your fix is 242°T, 2.7 nm from Tern Island tower. You steer 149°T at 8.5 kn through the water. At 1425 a new fix puts you 032°T, 2.2 nm from Mill stack.

   Plot the 1425 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 1050 your fix is 033°T, 1.5 nm from Tern Island tower. You steer 265°T at 7.5 kn through the water. At 1140 a new fix puts you 041°T, 2.3 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1340 your fix is 187°T, 1.3 nm from Gannet Rock daybeacon. You steer 299°T at 6.6 kn through the water. At 1425 a new fix puts you 031°T, 3.2 nm from Heron Point Light.

   Plot the 1425 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  

8. At 0950 your fix is 227°T, 3.4 nm from Tern Island tower. You steer 306°T at 4.7 kn through the water. At 1030 a new fix puts you 045°T, 2.5 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn