Worksheet 238 · Skill 5

Set and drift

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1. At 1200 your fix is 252°T, 2.9 nm from Gannet Rock daybeacon. You steer 291°T at 8.4 kn through the water. At 1235 a new fix puts you 149°T, 1.1 nm from Westfield church spire.

   Plot the 1235 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 1425 your fix is 037°T, 4.0 nm from Westfield church spire. You steer 136°T at 7.4 kn through the water. At 1500 a new fix puts you 259°T, 2.7 nm from Tern Island tower.

   Plot the 1500 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 0755 your fix is 045°T, 1.7 nm from Tern Island tower. You steer 271°T at 4.5 kn through the water. At 0825 a new fix puts you 347°T, 1.6 nm from Tern Island tower.

   Plot the 0825 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 1155 your fix is 337°T, 2.2 nm from Mill stack. You steer 094°T at 8.7 kn through the water. At 1245 a new fix puts you 111°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1245 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 1035 your fix is 049°T, 2.6 nm from Gannet Rock daybeacon. You steer 240°T at 4.5 kn through the water. At 1200 a new fix puts you 095°T, 2.1 nm from Heron Point Light.

   Plot the 1200 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  

6. At 1545 your fix is 075°T, 2.9 nm from Tern Island tower. You steer 180°T at 6.6 kn through the water. At 1625 a new fix puts you 003°T, 1.4 nm from Kittle water tank.

   Plot the 1625 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  

7. At 0820 your fix is 114°T, 2.4 nm from Westfield church spire. You steer 046°T at 5.5 kn through the water. At 0850 a new fix puts you 272°T, 3.0 nm from Tern Island tower.

   Plot the 0850 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  

8. At 1140 your fix is 353°T, 0.9 nm from Gannet Rock daybeacon. You steer 266°T at 6.8 kn through the water. At 1230 a new fix puts you 098°T, 3.1 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn