Worksheet 363 · Skill 5

Set and drift

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1. At 0845 your fix is 087°T, 1.3 nm from Heron Point Light. You steer 350°T at 6.8 kn through the water. At 0915 a new fix puts you 099°T, 3.1 nm from Westfield church spire.

   Plot the 0915 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  

2. At 1420 your fix is 087°T, 1.5 nm from Gannet Rock daybeacon. You steer 359°T at 5.1 kn through the water. At 1515 a new fix puts you 026°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1515 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 1350 your fix is 025°T, 2.5 nm from Gannet Rock daybeacon. You steer 124°T at 5.2 kn through the water. At 1420 a new fix puts you 078°T, 2.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1520 your fix is 032°T, 2.6 nm from Gannet Rock daybeacon. You steer 047°T at 4.3 kn through the water. At 1550 a new fix puts you 072°T, 4.9 nm from Tern Island tower.

   Plot the 1550 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 0755 your fix is 029°T, 2.3 nm from Mill stack. You steer 288°T at 6.3 kn through the water. At 0840 a new fix puts you 052°T, 1.1 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1350 your fix is 071°T, 2.6 nm from Heron Point Light. You steer 351°T at 7.3 kn through the water. At 1435 a new fix puts you 028°T, 3.8 nm from Westfield church spire.

   Plot the 1435 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  

7. At 1555 your fix is 276°T, 1.4 nm from Tern Island tower. You steer 194°T at 4.7 kn through the water. At 1650 a new fix puts you 334°T, 1.2 nm from Mill stack.

   Plot the 1650 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 1420 your fix is 088°T, 1.6 nm from Heron Point Light. You steer 093°T at 4.6 kn through the water. At 1455 a new fix puts you 244°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1455 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