Worksheet 472 · Skill 5

Set and drift

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1. At 0725 your fix is 286°T, 4.1 nm from Tern Island tower. You steer 137°T at 7.6 kn through the water. At 0810 a new fix puts you 202°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 0810 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 1510 your fix is 032°T, 3.2 nm from Heron Point Light. You steer 299°T at 4.4 kn through the water. At 1605 a new fix puts you 068°T, 1.4 nm from Westfield church spire.

   Plot the 1605 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 1245 your fix is 041°T, 2.0 nm from Gannet Rock daybeacon. You steer 187°T at 5.6 kn through the water. At 1320 a new fix puts you 342°T, 2.8 nm from Kittle water tank.

   Plot the 1320 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  

4. At 1045 your fix is 097°T, 1.2 nm from Gannet Rock daybeacon. You steer 001°T at 4.1 kn through the water. At 1135 a new fix puts you 108°T, 1.4 nm from Tern Island tower.

   Plot the 1135 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  

5. At 1120 your fix is 285°T, 3.7 nm from Tern Island tower. You steer 178°T at 4.8 kn through the water. At 1230 a new fix puts you 347°T, 2.4 nm from Mill stack.

   Plot the 1230 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  

6. At 0850 your fix is 035°T, 3.8 nm from Westfield church spire. You steer 184°T at 4.3 kn through the water. At 0930 a new fix puts you 084°T, 3.4 nm from Westfield church spire.

   Plot the 0930 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 1555 your fix is 000°T, 1.6 nm from Heron Point Light. You steer 355°T at 8.6 kn through the water. At 1625 a new fix puts you 043°T, 2.2 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1455 your fix is 062°T, 5.1 nm from Tern Island tower. You steer 187°T at 6.4 kn through the water. At 1555 a new fix puts you 327°T, 1.6 nm from Kittle water tank.

   Plot the 1555 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