Worksheet 536 · Skill 5

Set and drift

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1. At 1425 your fix is 002°T, 1.0 nm from Heron Point Light. You steer 102°T at 4.7 kn through the water. At 1540 a new fix puts you 180°T, 1.4 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1250 your fix is 010°T, 2.7 nm from Mill stack. You steer 253°T at 4.9 kn through the water. At 1320 a new fix puts you 058°T, 2.1 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1545 your fix is 062°T, 2.4 nm from Tern Island tower. You steer 160°T at 5.8 kn through the water. At 1620 a new fix puts you 344°T, 3.1 nm from Kittle water tank.

   Plot the 1620 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 223°T, 3.4 nm from Tern Island tower. You steer 312°T at 7.3 kn through the water. At 1120 a new fix puts you 034°T, 2.2 nm from Westfield church spire.

   Plot the 1120 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  

5. At 1030 your fix is 207°T, 2.8 nm from Tern Island tower. You steer 305°T at 7.2 kn through the water. At 1100 a new fix puts you 274°T, 3.3 nm from Tern Island tower.

   Plot the 1100 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  

6. At 1525 your fix is 068°T, 1.1 nm from Heron Point Light. You steer 083°T at 8.4 kn through the water. At 1630 a new fix puts you 120°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1630 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  

7. At 0915 your fix is 025°T, 1.6 nm from Gannet Rock daybeacon. You steer 038°T at 4.6 kn through the water. At 0945 a new fix puts you 047°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 0945 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 0850 your fix is 286°T, 0.9 nm from Gannet Rock daybeacon. You steer 240°T at 5.0 kn through the water. At 0940 a new fix puts you 344°T, 1.6 nm from Mill stack.

   Plot the 0940 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