Worksheet 840 · Skill 5

Set and drift

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1. At 1545 your fix is 219°T, 1.4 nm from Gannet Rock daybeacon. You steer 245°T at 4.5 kn through the water. At 1640 a new fix puts you 327°T, 1.5 nm from Mill stack.

   Plot the 1640 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  

2. At 1245 your fix is 264°T, 3.4 nm from Tern Island tower. You steer 285°T at 4.3 kn through the water. At 1330 a new fix puts you 050°T, 2.5 nm from Westfield church spire.

   Plot the 1330 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 0755 your fix is 303°T, 2.4 nm from Tern Island tower. You steer 215°T at 5.6 kn through the water. At 0835 a new fix puts you 033°T, 2.3 nm from Heron Point Light.

   Plot the 0835 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 0755 your fix is 022°T, 2.6 nm from Westfield church spire. You steer 147°T at 8.4 kn through the water. At 0830 a new fix puts you 075°T, 1.6 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1140 your fix is 061°T, 2.0 nm from Gannet Rock daybeacon. You steer 216°T at 4.0 kn through the water. At 1215 a new fix puts you 154°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1215 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 0940 your fix is 060°T, 4.4 nm from Tern Island tower. You steer 214°T at 7.4 kn through the water. At 1050 a new fix puts you 008°T, 2.7 nm from Mill stack.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0955 your fix is 301°T, 2.0 nm from Kittle water tank. You steer 303°T at 6.0 kn through the water. At 1100 a new fix puts you 074°T, 2.1 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0710 your fix is 276°T, 3.2 nm from Tern Island tower. You steer 234°T at 5.3 kn through the water. At 0745 a new fix puts you 344°T, 2.0 nm from Heron Point Light.

   Plot the 0745 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