Worksheet 400 · Skill 5

Set and drift

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1. At 0950 your fix is 026°T, 2.0 nm from Tern Island tower. You steer 124°T at 4.0 kn through the water. At 1035 a new fix puts you 046°T, 1.7 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1335 your fix is 078°T, 3.0 nm from Tern Island tower. You steer 184°T at 5.0 kn through the water. At 1420 a new fix puts you 147°T, 1.3 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1510 your fix is 346°T, 3.0 nm from Mill stack. You steer 113°T at 8.1 kn through the water. At 1540 a new fix puts you 222°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1540 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 1540 your fix is 134°T, 1.5 nm from Westfield church spire. You steer 071°T at 4.9 kn through the water. At 1625 a new fix puts you 211°T, 2.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1145 your fix is 038°T, 1.7 nm from Westfield church spire. You steer 179°T at 5.2 kn through the water. At 1220 a new fix puts you 145°T, 3.3 nm from Westfield church spire.

   Plot the 1220 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 1545 your fix is 084°T, 2.5 nm from Gannet Rock daybeacon. You steer 218°T at 4.4 kn through the water. At 1625 a new fix puts you 320°T, 1.7 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 1045 your fix is 050°T, 3.8 nm from Westfield church spire. You steer 210°T at 5.3 kn through the water. At 1125 a new fix puts you 135°T, 1.1 nm from Westfield church spire.

   Plot the 1125 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  

8. At 0940 your fix is 088°T, 1.2 nm from Westfield church spire. You steer 110°T at 5.3 kn through the water. At 1050 a new fix puts you 244°T, 2.7 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn