Worksheet 555 · Skill 5

Set and drift

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1. At 1025 your fix is 306°T, 1.7 nm from Kittle water tank. You steer 293°T at 5.8 kn through the water. At 1150 a new fix puts you 027°T, 2.8 nm from Westfield church spire.

   Plot the 1150 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  

2. At 1310 your fix is 016°T, 1.7 nm from Heron Point Light. You steer 045°T at 5.9 kn through the water. At 1345 a new fix puts you 262°T, 3.6 nm from Tern Island tower.

   Plot the 1345 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 0845 your fix is 150°T, 1.4 nm from Gannet Rock daybeacon. You steer 296°T at 7.0 kn through the water. At 0920 a new fix puts you 214°T, 2.7 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1205 your fix is 072°T, 1.3 nm from Gannet Rock daybeacon. You steer 328°T at 6.2 kn through the water. At 1235 a new fix puts you 047°T, 1.8 nm from Tern Island tower.

   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  

5. At 1305 your fix is 118°T, 1.4 nm from Gannet Rock daybeacon. You steer 019°T at 5.2 kn through the water. At 1355 a new fix puts you 032°T, 3.8 nm from Gannet Rock daybeacon.

   Plot the 1355 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  

6. At 1405 your fix is 025°T, 3.2 nm from Heron Point Light. You steer 132°T at 6.4 kn through the water. At 1440 a new fix puts you 207°T, 3.1 nm from Tern Island tower.

   Plot the 1440 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 0915 your fix is 331°T, 1.2 nm from Gannet Rock daybeacon. You steer 204°T at 5.1 kn through the water. At 0945 a new fix puts you 235°T, 1.3 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1005 your fix is 039°T, 2.5 nm from Gannet Rock daybeacon. You steer 255°T at 6.1 kn through the water. At 1050 a new fix puts you 204°T, 1.7 nm from Tern Island tower.

   Plot the 1050 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