Worksheet 466 · Skill 5

Set and drift

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1. At 1240 your fix is 112°T, 1.2 nm from Westfield church spire. You steer 115°T at 5.0 kn through the water. At 1355 a new fix puts you 206°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1355 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0715 your fix is 080°T, 1.7 nm from Westfield church spire. You steer 098°T at 8.3 kn through the water. At 0755 a new fix puts you 274°T, 2.4 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1240 your fix is 248°T, 2.5 nm from Tern Island tower. You steer 255°T at 5.4 kn through the water. At 1330 a new fix puts you 324°T, 1.8 nm from Heron Point Light.

   Plot the 1330 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 1250 your fix is 150°T, 1.7 nm from Westfield church spire. You steer 048°T at 6.8 kn through the water. At 1345 a new fix puts you 282°T, 2.8 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0950 your fix is 160°T, 1.2 nm from Tern Island tower. You steer 074°T at 4.9 kn through the water. At 1040 a new fix puts you 039°T, 4.2 nm from Gannet Rock daybeacon.

   Plot the 1040 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 0905 your fix is 158°T, 1.3 nm from Tern Island tower. You steer 171°T at 7.0 kn through the water. At 0935 a new fix puts you 308°T, 1.4 nm from Kittle water tank.

   Plot the 0935 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  

7. At 1545 your fix is 351°T, 2.3 nm from Mill stack. You steer 293°T at 4.8 kn through the water. At 1615 a new fix puts you 060°T, 1.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1310 your fix is 088°T, 2.5 nm from Westfield church spire. You steer 133°T at 4.6 kn through the water. At 1420 a new fix puts you 044°T, 2.2 nm from Mill stack.

   Plot the 1420 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