Worksheet 62 · Skill 5

Set and drift

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1. At 1110 your fix is 007°T, 1.2 nm from Heron Point Light. You steer 077°T at 8.3 kn through the water. At 1205 a new fix puts you 300°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1205 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  

2. At 1530 your fix is 316°T, 1.5 nm from Gannet Rock daybeacon. You steer 285°T at 5.4 kn through the water. At 1625 a new fix puts you 255°T, 2.9 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0955 your fix is 280°T, 2.7 nm from Tern Island tower. You steer 167°T at 4.2 kn through the water. At 1035 a new fix puts you 238°T, 2.4 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1015 your fix is 038°T, 1.4 nm from Gannet Rock daybeacon. You steer 092°T at 4.3 kn through the water. At 1045 a new fix puts you 051°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1045 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 1430 your fix is 234°T, 2.5 nm from Tern Island tower. You steer 332°T at 5.0 kn through the water. At 1525 a new fix puts you 299°T, 4.3 nm from Tern Island tower.

   Plot the 1525 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  

6. At 1600 your fix is 022°T, 2.2 nm from Gannet Rock daybeacon. You steer 175°T at 5.7 kn through the water. At 1640 a new fix puts you 032°T, 1.6 nm from Kittle water tank.

   Plot the 1640 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 0850 your fix is 005°T, 3.4 nm from Westfield church spire. You steer 149°T at 4.6 kn through the water. At 1010 a new fix puts you 259°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1010 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  

8. At 1110 your fix is 350°T, 3.3 nm from Mill stack. You steer 050°T at 5.9 kn through the water. At 1140 a new fix puts you 210°T, 1.2 nm from Tern Island tower.

   Plot the 1140 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