Worksheet 303 · Skill 5

Set and drift

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1. At 0955 your fix is 085°T, 1.7 nm from Heron Point Light. You steer 091°T at 8.3 kn through the water. At 1025 a new fix puts you 224°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1025 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 0815 your fix is 110°T, 0.9 nm from Gannet Rock daybeacon. You steer 352°T at 4.4 kn through the water. At 0850 a new fix puts you 081°T, 1.6 nm from Tern Island tower.

   Plot the 0850 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  

3. At 1445 your fix is 065°T, 4.5 nm from Tern Island tower. You steer 201°T at 7.8 kn through the water. At 1530 a new fix puts you 180°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1530 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  

4. At 1440 your fix is 095°T, 3.1 nm from Westfield church spire. You steer 077°T at 4.2 kn through the water. At 1510 a new fix puts you 221°T, 1.9 nm from Tern Island tower.

   Plot the 1510 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 1045 your fix is 057°T, 3.4 nm from Westfield church spire. You steer 106°T at 6.1 kn through the water. At 1115 a new fix puts you 254°T, 1.8 nm from Tern Island tower.

   Plot the 1115 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 0845 your fix is 320°T, 3.0 nm from Tern Island tower. You steer 228°T at 4.3 kn through the water. At 1005 a new fix puts you 011°T, 1.9 nm from Heron Point Light.

   Plot the 1005 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  

7. At 0855 your fix is 015°T, 2.9 nm from Westfield church spire. You steer 091°T at 5.0 kn through the water. At 1020 a new fix puts you 060°T, 1.9 nm from Tern Island tower.

   Plot the 1020 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1425 your fix is 082°T, 2.4 nm from Tern Island tower. You steer 149°T at 7.6 kn through the water. At 1500 a new fix puts you 024°T, 1.9 nm from Kittle water tank.

   Plot the 1500 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