Worksheet 512 · Skill 5

Set and drift

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1. At 1520 your fix is 033°T, 2.6 nm from Heron Point Light. You steer 079°T at 8.8 kn through the water. At 1605 a new fix puts you 049°T, 2.7 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1105 your fix is 244°T, 2.9 nm from Tern Island tower. You steer 131°T at 4.9 kn through the water. At 1140 a new fix puts you 259°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1140 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 1310 your fix is 287°T, 2.2 nm from Tern Island tower. You steer 160°T at 6.0 kn through the water. At 1405 a new fix puts you 256°T, 1.2 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0835 your fix is 035°T, 3.4 nm from Heron Point Light. You steer 355°T at 4.7 kn through the water. At 0920 a new fix puts you 288°T, 4.1 nm from Tern Island tower.

   Plot the 0920 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  

5. At 1025 your fix is 313°T, 3.4 nm from Tern Island tower. You steer 107°T at 7.4 kn through the water. At 1125 a new fix puts you 037°T, 5.0 nm from Gannet Rock daybeacon.

   Plot the 1125 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  

6. At 1515 your fix is 005°T, 1.4 nm from Westfield church spire. You steer 116°T at 7.8 kn through the water. At 1640 a new fix puts you 231°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1640 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  

7. At 1405 your fix is 290°T, 3.6 nm from Tern Island tower. You steer 187°T at 5.5 kn through the water. At 1455 a new fix puts you 051°T, 3.0 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1025 your fix is 038°T, 3.2 nm from Gannet Rock daybeacon. You steer 178°T at 6.2 kn through the water. At 1110 a new fix puts you 349°T, 1.1 nm from Kittle water tank.

   Plot the 1110 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