Worksheet 222 · Skill 5

Set and drift

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1. At 1420 your fix is 061°T, 5.1 nm from Tern Island tower. You steer 217°T at 4.5 kn through the water. At 1505 a new fix puts you 035°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1505 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  

2. At 0725 your fix is 288°T, 1.4 nm from Tern Island tower. You steer 222°T at 4.0 kn through the water. At 0810 a new fix puts you 236°T, 2.5 nm from Tern Island tower.

   Plot the 0810 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 0830 your fix is 124°T, 1.4 nm from Tern Island tower. You steer 065°T at 5.1 kn through the water. At 0915 a new fix puts you 065°T, 5.2 nm from Tern Island tower.

   Plot the 0915 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  

4. At 1540 your fix is 339°T, 1.4 nm from Kittle water tank. You steer 292°T at 6.0 kn through the water. At 1710 a new fix puts you 043°T, 2.0 nm from Westfield church spire.

   Plot the 1710 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1230 your fix is 286°T, 1.5 nm from Gannet Rock daybeacon. You steer 309°T at 4.3 kn through the water. At 1300 a new fix puts you 193°T, 1.3 nm from Tern Island tower.

   Plot the 1300 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  

6. At 1220 your fix is 034°T, 2.7 nm from Gannet Rock daybeacon. You steer 228°T at 4.4 kn through the water. At 1345 a new fix puts you 051°T, 3.4 nm from Heron Point Light.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1510 your fix is 320°T, 1.4 nm from Gannet Rock daybeacon. You steer 262°T at 4.5 kn through the water. At 1630 a new fix puts you 236°T, 3.4 nm from Tern Island tower.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0800 your fix is 324°T, 2.2 nm from Mill stack. You steer 013°T at 4.2 kn through the water. At 0835 a new fix puts you 049°T, 3.0 nm from Heron Point Light.

   Plot the 0835 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