Worksheet 306 · Skill 5

Set and drift

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1. At 1215 your fix is 347°T, 2.3 nm from Mill stack. You steer 348°T at 5.3 kn through the water. At 1330 a new fix puts you 303°T, 2.7 nm from Tern Island tower.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1305 your fix is 267°T, 2.7 nm from Gannet Rock daybeacon. You steer 248°T at 5.1 kn through the water. At 1355 a new fix puts you 320°T, 2.2 nm from Mill stack.

   Plot the 1355 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  

3. At 1300 your fix is 081°T, 2.5 nm from Gannet Rock daybeacon. You steer 269°T at 4.0 kn through the water. At 1330 a new fix puts you 008°T, 0.9 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1125 your fix is 046°T, 3.0 nm from Westfield church spire. You steer 141°T at 4.0 kn through the water. At 1245 a new fix puts you 015°T, 2.2 nm from Mill stack.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1105 your fix is 096°T, 1.7 nm from Westfield church spire. You steer 152°T at 5.3 kn through the water. At 1135 a new fix puts you 064°T, 0.8 nm from Heron Point Light.

   Plot the 1135 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 1235 your fix is 270°T, 2.4 nm from Gannet Rock daybeacon. You steer 309°T at 6.0 kn through the water. At 1325 a new fix puts you 046°T, 3.6 nm from Westfield church spire.

   Plot the 1325 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 1005 your fix is 254°T, 3.0 nm from Tern Island tower. You steer 022°T at 5.7 kn through the water. At 1035 a new fix puts you 337°T, 2.1 nm from Tern Island tower.

   Plot the 1035 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 0955 your fix is 037°T, 1.2 nm from Heron Point Light. You steer 026°T at 7.5 kn through the water. At 1030 a new fix puts you 275°T, 1.7 nm from Tern Island tower.

   Plot the 1030 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