Worksheet 300 · Skill 5

Set and drift

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1. At 0740 your fix is 051°T, 4.1 nm from Westfield church spire. You steer 143°T at 6.5 kn through the water. At 0840 a new fix puts you 266°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 0840 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1300 your fix is 102°T, 2.3 nm from Westfield church spire. You steer 107°T at 8.8 kn through the water. At 1400 a new fix puts you 208°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1400 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1330 your fix is 058°T, 1.7 nm from Tern Island tower. You steer 142°T at 4.3 kn through the water. At 1410 a new fix puts you 092°T, 1.2 nm from Gannet Rock daybeacon.

   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  

4. At 1230 your fix is 132°T, 1.8 nm from Westfield church spire. You steer 102°T at 5.4 kn through the water. At 1330 a new fix puts you 261°T, 2.4 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1215 your fix is 032°T, 3.6 nm from Westfield church spire. You steer 147°T at 6.5 kn through the water. At 1315 a new fix puts you 260°T, 3.1 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1150 your fix is 258°T, 2.7 nm from Gannet Rock daybeacon. You steer 270°T at 4.3 kn through the water. At 1240 a new fix puts you 352°T, 1.3 nm from Heron Point Light.

   Plot the 1240 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 0905 your fix is 335°T, 1.4 nm from Heron Point Light. You steer 100°T at 4.6 kn through the water. At 1010 a new fix puts you 016°T, 1.5 nm from Mill stack.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1600 your fix is 356°T, 2.3 nm from Mill stack. You steer 053°T at 5.2 kn through the water. At 1720 a new fix puts you 068°T, 3.9 nm from Tern Island tower.

   Plot the 1720 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