Worksheet 925 · Skill 5

Set and drift

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1. At 0745 your fix is 011°T, 3.1 nm from Mill stack. You steer 344°T at 6.2 kn through the water. At 0830 a new fix puts you 271°T, 1.8 nm from Tern Island tower.

   Plot the 0830 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 1235 your fix is 061°T, 2.5 nm from Westfield church spire. You steer 104°T at 6.9 kn through the water. At 1310 a new fix puts you 200°T, 2.3 nm from Tern Island tower.

   Plot the 1310 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 1020 your fix is 048°T, 1.9 nm from Kittle water tank. You steer 327°T at 5.7 kn through the water. At 1120 a new fix puts you 023°T, 2.2 nm from Tern Island tower.

   Plot the 1120 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  

4. At 0725 your fix is 331°T, 1.6 nm from Heron Point Light. You steer 087°T at 5.2 kn through the water. At 0755 a new fix puts you 038°T, 3.3 nm from Heron Point Light.

   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  

5. At 1410 your fix is 210°T, 1.1 nm from Gannet Rock daybeacon. You steer 291°T at 4.2 kn through the water. At 1455 a new fix puts you 255°T, 2.3 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  

6. At 1510 your fix is 343°T, 1.9 nm from Tern Island tower. You steer 225°T at 5.8 kn through the water. At 1615 a new fix puts you 030°T, 2.9 nm from Heron Point Light.

   Plot the 1615 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1340 your fix is 270°T, 1.5 nm from Gannet Rock daybeacon. You steer 293°T at 7.6 kn through the water. At 1435 a new fix puts you 061°T, 1.0 nm from Westfield church spire.

   Plot the 1435 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  

8. At 1355 your fix is 144°T, 1.6 nm from Westfield church spire. You steer 052°T at 4.6 kn through the water. At 1505 a new fix puts you 271°T, 3.5 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn