Worksheet 68 · Skill 5

Set and drift

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1. At 0925 your fix is 086°T, 0.9 nm from Gannet Rock daybeacon. You steer 214°T at 5.6 kn through the water. At 1000 a new fix puts you 298°T, 1.6 nm from Kittle water tank.

   Plot the 1000 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 1420 your fix is 079°T, 3.2 nm from Westfield church spire. You steer 109°T at 7.8 kn through the water. At 1455 a new fix puts you 246°T, 1.7 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1325 your fix is 344°T, 2.5 nm from Tern Island tower. You steer 243°T at 5.5 kn through the water. At 1400 a new fix puts you 280°T, 3.5 nm from Tern Island tower.

   Plot the 1400 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 0855 your fix is 006°T, 2.2 nm from Mill stack. You steer 282°T at 7.4 kn through the water. At 0930 a new fix puts you 018°T, 1.6 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0710 your fix is 048°T, 3.8 nm from Gannet Rock daybeacon. You steer 173°T at 6.7 kn through the water. At 0740 a new fix puts you 037°T, 2.3 nm from Kittle water tank.

   Plot the 0740 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 0725 your fix is 045°T, 4.3 nm from Westfield church spire. You steer 137°T at 6.1 kn through the water. At 0840 a new fix puts you 357°T, 1.3 nm from Kittle water tank.

   Plot the 0840 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  

7. At 0855 your fix is 264°T, 1.4 nm from Tern Island tower. You steer 274°T at 6.3 kn through the water. At 0930 a new fix puts you 062°T, 3.7 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0735 your fix is 063°T, 2.0 nm from Westfield church spire. You steer 129°T at 8.7 kn through the water. At 0810 a new fix puts you 353°T, 3.4 nm from Mill stack.

   Plot the 0810 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