Worksheet 264 · Skill 5

Set and drift

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1. At 1005 your fix is 343°T, 2.4 nm from Tern Island tower. You steer 217°T at 4.0 kn through the water. At 1105 a new fix puts you 037°T, 2.9 nm from Heron Point Light.

   Plot the 1105 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  

2. At 1015 your fix is 214°T, 1.8 nm from Tern Island tower. You steer 293°T at 6.3 kn through the water. At 1045 a new fix puts you 086°T, 3.0 nm from Westfield church spire.

   Plot the 1045 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 0915 your fix is 055°T, 1.9 nm from Westfield church spire. You steer 149°T at 4.3 kn through the water. At 1040 a new fix puts you 060°T, 3.1 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1440 your fix is 265°T, 2.7 nm from Tern Island tower. You steer 048°T at 4.2 kn through the water. At 1530 a new fix puts you 023°T, 1.7 nm from Tern Island tower.

   Plot the 1530 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  

5. At 1115 your fix is 123°T, 1.3 nm from Gannet Rock daybeacon. You steer 274°T at 6.8 kn through the water. At 1220 a new fix puts you 349°T, 1.8 nm from Heron Point Light.

   Plot the 1220 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1255 your fix is 342°T, 2.4 nm from Mill stack. You steer 060°T at 5.7 kn through the water. At 1400 a new fix puts you 347°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1400 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0700 your fix is 108°T, 2.4 nm from Westfield church spire. You steer 106°T at 4.1 kn through the water. At 0740 a new fix puts you 256°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 0740 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  

8. At 1600 your fix is 214°T, 2.3 nm from Tern Island tower. You steer 317°T at 6.5 kn through the water. At 1655 a new fix puts you 044°T, 4.5 nm from Westfield church spire.

   Plot the 1655 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