Worksheet 200 · Skill 5

Set and drift

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1. At 1545 your fix is 285°T, 1.4 nm from Gannet Rock daybeacon. You steer 293°T at 5.0 kn through the water. At 1615 a new fix puts you 229°T, 2.5 nm from Tern Island tower.

   Plot the 1615 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 1120 your fix is 076°T, 1.9 nm from Heron Point Light. You steer 038°T at 4.5 kn through the water. At 1205 a new fix puts you 240°T, 2.0 nm from Tern Island tower.

   Plot the 1205 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  

3. At 1315 your fix is 083°T, 1.9 nm from Gannet Rock daybeacon. You steer 242°T at 5.7 kn through the water. At 1350 a new fix puts you 232°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1350 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 0810 your fix is 076°T, 3.9 nm from Tern Island tower. You steer 196°T at 4.4 kn through the water. At 0900 a new fix puts you 053°T, 2.7 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1545 your fix is 054°T, 2.7 nm from Westfield church spire. You steer 138°T at 6.5 kn through the water. At 1640 a new fix puts you 345°T, 2.8 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1205 your fix is 271°T, 3.3 nm from Tern Island tower. You steer 162°T at 5.2 kn through the water. At 1310 a new fix puts you 081°T, 1.6 nm from Heron Point Light.

   Plot the 1310 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 1400 your fix is 000°T, 2.1 nm from Mill stack. You steer 317°T at 4.2 kn through the water. At 1520 a new fix puts you 067°T, 3.5 nm from Westfield church spire.

   Plot the 1520 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  

8. At 1140 your fix is 045°T, 3.9 nm from Westfield church spire. You steer 081°T at 4.4 kn through the water. At 1245 a new fix puts you 312°T, 2.3 nm from Tern Island tower.

   Plot the 1245 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