Worksheet 773 · Skill 5

Set and drift

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1. At 1430 your fix is 083°T, 1.6 nm from Heron Point Light. You steer 082°T at 5.5 kn through the water. At 1505 a new fix puts you 216°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1505 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  

2. At 1425 your fix is 033°T, 2.4 nm from Mill stack. You steer 028°T at 6.5 kn through the water. At 1455 a new fix puts you 301°T, 1.1 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0755 your fix is 007°T, 3.6 nm from Westfield church spire. You steer 138°T at 8.9 kn through the water. At 0900 a new fix puts you 356°T, 1.7 nm from Mill stack.

   Plot the 0900 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  

4. At 1330 your fix is 037°T, 4.0 nm from Westfield church spire. You steer 121°T at 4.9 kn through the water. At 1405 a new fix puts you 294°T, 3.1 nm from Tern Island tower.

   Plot the 1405 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 1220 your fix is 004°T, 2.9 nm from Mill stack. You steer 110°T at 7.6 kn through the water. At 1250 a new fix puts you 195°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1250 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 1050 your fix is 065°T, 1.8 nm from Westfield church spire. You steer 126°T at 4.2 kn through the water. At 1145 a new fix puts you 061°T, 2.9 nm from Heron Point Light.

   Plot the 1145 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  

7. At 0820 your fix is 203°T, 1.8 nm from Gannet Rock daybeacon. You steer 312°T at 5.2 kn through the water. At 0930 a new fix puts you 246°T, 3.3 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1455 your fix is 037°T, 2.2 nm from Mill stack. You steer 338°T at 4.6 kn through the water. At 1555 a new fix puts you 037°T, 3.4 nm from Heron Point Light.

   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