Worksheet 101 · Skill 5

Set and drift

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1. At 0840 your fix is 261°T, 1.2 nm from Gannet Rock daybeacon. You steer 291°T at 8.8 kn through the water. At 0920 a new fix puts you 065°T, 3.0 nm from Westfield church spire.

   Plot the 0920 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  

2. At 1500 your fix is 251°T, 2.8 nm from Tern Island tower. You steer 168°T at 4.0 kn through the water. At 1535 a new fix puts you 350°T, 3.3 nm from Mill stack.

   Plot the 1535 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 0705 your fix is 089°T, 2.9 nm from Gannet Rock daybeacon. You steer 235°T at 7.0 kn through the water. At 0735 a new fix puts you 165°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 0735 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 1245 your fix is 049°T, 2.6 nm from Mill stack. You steer 068°T at 5.1 kn through the water. At 1315 a new fix puts you 016°T, 1.6 nm from Kittle water tank.

   Plot the 1315 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 1035 your fix is 079°T, 2.7 nm from Gannet Rock daybeacon. You steer 308°T at 6.0 kn through the water. At 1105 a new fix puts you 084°T, 2.6 nm from Tern Island tower.

   Plot the 1105 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 1035 your fix is 052°T, 3.6 nm from Tern Island tower. You steer 264°T at 5.5 kn through the water. At 1105 a new fix puts you 352°T, 2.2 nm from Tern Island tower.

   Plot the 1105 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  

7. At 0730 your fix is 082°T, 2.1 nm from Westfield church spire. You steer 128°T at 6.0 kn through the water. At 0825 a new fix puts you 064°T, 2.6 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1330 your fix is 082°T, 1.8 nm from Westfield church spire. You steer 062°T at 8.4 kn through the water. At 1410 a new fix puts you 334°T, 1.4 nm from Tern Island tower.

   Plot the 1410 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