Worksheet 348 · Skill 5

Set and drift

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1. At 1145 your fix is 207°T, 3.3 nm from Tern Island tower. You steer 069°T at 4.3 kn through the water. At 1240 a new fix puts you 036°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1240 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  

2. At 1355 your fix is 107°T, 1.9 nm from Gannet Rock daybeacon. You steer 019°T at 5.5 kn through the water. At 1440 a new fix puts you 041°T, 4.0 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1440 your fix is 095°T, 1.3 nm from Westfield church spire. You steer 073°T at 9.0 kn through the water. At 1510 a new fix puts you 246°T, 1.6 nm from Tern Island tower.

   Plot the 1510 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  

4. At 0725 your fix is 039°T, 3.0 nm from Westfield church spire. You steer 138°T at 5.1 kn through the water. At 0805 a new fix puts you 025°T, 2.8 nm from Heron Point Light.

   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  

5. At 0835 your fix is 251°T, 2.6 nm from Gannet Rock daybeacon. You steer 109°T at 4.2 kn through the water. At 0925 a new fix puts you 206°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 0925 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 0845 your fix is 246°T, 2.6 nm from Tern Island tower. You steer 091°T at 4.0 kn through the water. At 1010 a new fix puts you 026°T, 1.2 nm from Kittle water tank.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1410 your fix is 043°T, 2.1 nm from Tern Island tower. You steer 167°T at 4.9 kn through the water. At 1455 a new fix puts you 072°T, 1.0 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0740 your fix is 247°T, 3.4 nm from Tern Island tower. You steer 301°T at 4.7 kn through the water. At 0840 a new fix puts you 057°T, 1.0 nm from Westfield church spire.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn