Worksheet 579 · Skill 5

Set and drift

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1. At 1335 your fix is 175°T, 1.0 nm from Westfield church spire. You steer 117°T at 5.3 kn through the water. At 1415 a new fix puts you 071°T, 1.5 nm from Heron Point Light.

   Plot the 1415 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  

2. At 0755 your fix is 022°T, 1.8 nm from Heron Point Light. You steer 321°T at 6.9 kn through the water. At 0825 a new fix puts you 011°T, 1.5 nm from Westfield church spire.

   Plot the 0825 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 1255 your fix is 071°T, 2.1 nm from Heron Point Light. You steer 053°T at 6.2 kn through the water. At 1330 a new fix puts you 206°T, 1.4 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0810 your fix is 052°T, 3.3 nm from Gannet Rock daybeacon. You steer 210°T at 5.1 kn through the water. At 0850 a new fix puts you 127°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 0850 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  

5. At 1415 your fix is 216°T, 1.6 nm from Tern Island tower. You steer 260°T at 6.8 kn through the water. At 1500 a new fix puts you 097°T, 1.5 nm from Westfield church spire.

   Plot the 1500 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  

6. At 1450 your fix is 348°T, 1.1 nm from Gannet Rock daybeacon. You steer 195°T at 5.7 kn through the water. At 1525 a new fix puts you 206°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1525 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  

7. At 0840 your fix is 237°T, 1.9 nm from Gannet Rock daybeacon. You steer 280°T at 4.6 kn through the water. At 0940 a new fix puts you 017°T, 2.0 nm from Heron Point Light.

   Plot the 0940 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  

8. At 1555 your fix is 230°T, 3.2 nm from Tern Island tower. You steer 269°T at 4.2 kn through the water. At 1630 a new fix puts you 036°T, 1.8 nm from Heron Point Light.

   Plot the 1630 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