Worksheet 195 · Skill 5

Set and drift

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1. At 0950 your fix is 030°T, 2.3 nm from Tern Island tower. You steer 117°T at 7.5 kn through the water. At 1025 a new fix puts you 045°T, 3.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0740 your fix is 058°T, 2.2 nm from Heron Point Light. You steer 093°T at 5.0 kn through the water. At 0810 a new fix puts you 031°T, 2.1 nm from Mill stack.

   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  

3. At 0845 your fix is 051°T, 3.5 nm from Tern Island tower. You steer 200°T at 6.4 kn through the water. At 0925 a new fix puts you 294°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0925 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 0950 your fix is 054°T, 3.2 nm from Tern Island tower. You steer 268°T at 7.5 kn through the water. At 1050 a new fix puts you 063°T, 1.4 nm from Westfield church spire.

   Plot the 1050 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  

5. At 1410 your fix is 304°T, 3.8 nm from Tern Island tower. You steer 214°T at 4.1 kn through the water. At 1525 a new fix puts you 327°T, 1.7 nm from Heron Point Light.

   Plot the 1525 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 1425 your fix is 101°T, 1.9 nm from Westfield church spire. You steer 130°T at 4.8 kn through the water. At 1515 a new fix puts you 354°T, 1.4 nm from Mill stack.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0955 your fix is 249°T, 3.3 nm from Tern Island tower. You steer 111°T at 6.9 kn through the water. At 1040 a new fix puts you 063°T, 1.3 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1045 your fix is 043°T, 4.1 nm from Westfield church spire. You steer 275°T at 5.2 kn through the water. At 1115 a new fix puts you 001°T, 3.5 nm from Westfield church spire.

   Plot the 1115 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