Worksheet 95 · Skill 5

Set and drift

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1. At 1340 your fix is 225°T, 1.4 nm from Tern Island tower. You steer 101°T at 7.4 kn through the water. At 1415 a new fix puts you 064°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1415 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 1255 your fix is 051°T, 3.2 nm from Heron Point Light. You steer 078°T at 8.9 kn through the water. At 1330 a new fix puts you 149°T, 2.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1350 your fix is 109°T, 2.2 nm from Westfield church spire. You steer 060°T at 8.3 kn through the water. At 1420 a new fix puts you 290°T, 1.5 nm from Tern Island tower.

   Plot the 1420 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 1425 your fix is 160°T, 1.4 nm from Tern Island tower. You steer 085°T at 7.6 kn through the water. At 1455 a new fix puts you 060°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1455 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  

5. At 0945 your fix is 210°T, 2.0 nm from Gannet Rock daybeacon. You steer 054°T at 5.8 kn through the water. At 1030 a new fix puts you 073°T, 3.4 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1010 your fix is 316°T, 3.0 nm from Tern Island tower. You steer 104°T at 8.7 kn through the water. At 1050 a new fix puts you 033°T, 4.2 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1440 your fix is 254°T, 2.9 nm from Gannet Rock daybeacon. You steer 317°T at 7.9 kn through the water. At 1510 a new fix puts you 265°T, 3.3 nm from Tern Island tower.

   Plot the 1510 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 1440 your fix is 072°T, 4.5 nm from Tern Island tower. You steer 219°T at 6.4 kn through the water. At 1510 a new fix puts you 341°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1510 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