Worksheet 659 · Skill 5

Set and drift

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1. At 0725 your fix is 136°T, 1.7 nm from Westfield church spire. You steer 026°T at 8.4 kn through the water. At 0755 a new fix puts you 047°T, 3.3 nm from Westfield church spire.

   Plot the 0755 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 0750 your fix is 170°T, 1.0 nm from Gannet Rock daybeacon. You steer 245°T at 4.2 kn through the water. At 0845 a new fix puts you 083°T, 1.8 nm from Heron Point Light.

   Plot the 0845 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  

3. At 0735 your fix is 325°T, 1.5 nm from Gannet Rock daybeacon. You steer 112°T at 4.8 kn through the water. At 0825 a new fix puts you 064°T, 2.4 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0950 your fix is 017°T, 2.6 nm from Mill stack. You steer 086°T at 7.5 kn through the water. At 1030 a new fix puts you 008°T, 1.9 nm from Kittle water tank.

   Plot the 1030 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 0720 your fix is 203°T, 1.0 nm from Gannet Rock daybeacon. You steer 121°T at 4.2 kn through the water. At 0800 a new fix puts you 020°T, 1.2 nm from Kittle water tank.

   Plot the 0800 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 0705 your fix is 253°T, 2.6 nm from Gannet Rock daybeacon. You steer 257°T at 5.6 kn through the water. At 0740 a new fix puts you 073°T, 2.7 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1540 your fix is 026°T, 1.8 nm from Mill stack. You steer 056°T at 4.2 kn through the water. At 1610 a new fix puts you 234°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1610 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 1210 your fix is 016°T, 1.9 nm from Mill stack. You steer 075°T at 5.3 kn through the water. At 1245 a new fix puts you 142°T, 1.4 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn