Worksheet 189 · Skill 5

Set and drift

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1. At 0900 your fix is 252°T, 3.0 nm from Tern Island tower. You steer 120°T at 8.0 kn through the water. At 0945 a new fix puts you 027°T, 1.7 nm from Kittle water tank.

   Plot the 0945 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 0935 your fix is 062°T, 5.3 nm from Tern Island tower. You steer 242°T at 6.1 kn through the water. At 1010 a new fix puts you 051°T, 1.8 nm from Tern Island tower.

   Plot the 1010 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 1245 your fix is 065°T, 3.1 nm from Tern Island tower. You steer 219°T at 4.7 kn through the water. At 1335 a new fix puts you 239°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1335 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  

4. At 1420 your fix is 036°T, 2.6 nm from Westfield church spire. You steer 109°T at 5.5 kn through the water. At 1450 a new fix puts you 289°T, 3.8 nm from Tern Island tower.

   Plot the 1450 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 0725 your fix is 264°T, 2.9 nm from Tern Island tower. You steer 126°T at 6.0 kn through the water. At 0805 a new fix puts you 224°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0805 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1205 your fix is 138°T, 1.5 nm from Westfield church spire. You steer 133°T at 8.1 kn through the water. At 1235 a new fix puts you 077°T, 1.2 nm from Heron Point Light.

   Plot the 1235 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  

7. At 1300 your fix is 036°T, 3.6 nm from Westfield church spire. You steer 171°T at 6.2 kn through the water. At 1330 a new fix puts you 101°T, 3.0 nm from Westfield church spire.

   Plot the 1330 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  

8. At 1300 your fix is 318°T, 2.7 nm from Tern Island tower. You steer 098°T at 5.8 kn through the water. At 1405 a new fix puts you 027°T, 3.1 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn