Worksheet 471 · Skill 5

Set and drift

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1. At 0745 your fix is 225°T, 2.2 nm from Gannet Rock daybeacon. You steer 088°T at 5.5 kn through the water. At 0815 a new fix puts you 125°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0815 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 0930 your fix is 010°T, 2.1 nm from Mill stack. You steer 319°T at 5.3 kn through the water. At 1020 a new fix puts you 032°T, 3.2 nm from Heron Point Light.

   Plot the 1020 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  

3. At 1345 your fix is 342°T, 2.9 nm from Kittle water tank. You steer 027°T at 8.2 kn through the water. At 1415 a new fix puts you 073°T, 4.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1555 your fix is 311°T, 1.4 nm from Tern Island tower. You steer 249°T at 4.6 kn through the water. At 1625 a new fix puts you 075°T, 3.3 nm from Westfield church spire.

   Plot the 1625 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 1120 your fix is 092°T, 1.8 nm from Westfield church spire. You steer 117°T at 8.7 kn through the water. At 1155 a new fix puts you 350°T, 3.2 nm from Mill stack.

   Plot the 1155 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  

6. At 1005 your fix is 105°T, 2.1 nm from Gannet Rock daybeacon. You steer 344°T at 4.0 kn through the water. At 1045 a new fix puts you 045°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1045 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  

7. At 1345 your fix is 337°T, 1.7 nm from Heron Point Light. You steer 098°T at 7.2 kn through the water. At 1415 a new fix puts you 354°T, 2.9 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1430 your fix is 319°T, 1.2 nm from Gannet Rock daybeacon. You steer 021°T at 6.7 kn through the water. At 1510 a new fix puts you 049°T, 3.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn