Worksheet 479 · Skill 5

Set and drift

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1. At 1000 your fix is 044°T, 2.2 nm from Westfield church spire. You steer 148°T at 4.5 kn through the water. At 1050 a new fix puts you 017°T, 1.5 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1200 your fix is 003°T, 3.2 nm from Mill stack. You steer 150°T at 4.2 kn through the water. At 1230 a new fix puts you 048°T, 2.5 nm from Mill stack.

   Plot the 1230 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 1150 your fix is 068°T, 3.6 nm from Westfield church spire. You steer 060°T at 4.3 kn through the water. At 1220 a new fix puts you 300°T, 3.0 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0730 your fix is 030°T, 3.9 nm from Westfield church spire. You steer 219°T at 4.2 kn through the water. At 0805 a new fix puts you 020°T, 2.7 nm from Westfield church spire.

   Plot the 0805 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 0800 your fix is 003°T, 2.3 nm from Westfield church spire. You steer 077°T at 8.0 kn through the water. At 0830 a new fix puts you 304°T, 3.3 nm from Tern Island tower.

   Plot the 0830 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 1250 your fix is 023°T, 2.5 nm from Tern Island tower. You steer 244°T at 8.0 kn through the water. At 1350 a new fix puts you 100°T, 2.2 nm from Westfield church spire.

   Plot the 1350 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  

7. At 1305 your fix is 027°T, 3.4 nm from Westfield church spire. You steer 145°T at 6.7 kn through the water. At 1350 a new fix puts you 058°T, 3.3 nm from Heron Point Light.

   Plot the 1350 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 1555 your fix is 168°T, 1.7 nm from Gannet Rock daybeacon. You steer 307°T at 8.8 kn through the water. At 1705 a new fix puts you 005°T, 1.8 nm from Westfield church spire.

   Plot the 1705 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