Worksheet 384 · Skill 5

Set and drift

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1. At 0935 your fix is 051°T, 1.7 nm from Heron Point Light. You steer 074°T at 4.4 kn through the water. At 1015 a new fix puts you 257°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1015 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  

2. At 1140 your fix is 308°T, 1.4 nm from Tern Island tower. You steer 229°T at 8.6 kn through the water. At 1210 a new fix puts you 085°T, 2.5 nm from Westfield church spire.

   Plot the 1210 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  

3. At 1000 your fix is 343°T, 1.8 nm from Mill stack. You steer 292°T at 6.1 kn through the water. At 1040 a new fix puts you 025°T, 1.7 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1350 your fix is 316°T, 2.6 nm from Tern Island tower. You steer 190°T at 6.1 kn through the water. At 1420 a new fix puts you 230°T, 1.9 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1325 your fix is 174°T, 1.7 nm from Tern Island tower. You steer 250°T at 7.9 kn through the water. At 1400 a new fix puts you 350°T, 1.2 nm from Heron Point Light.

   Plot the 1400 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 0830 your fix is 344°T, 1.5 nm from Tern Island tower. You steer 270°T at 6.1 kn through the water. At 0905 a new fix puts you 047°T, 3.5 nm from Westfield church spire.

   Plot the 0905 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  

7. At 0945 your fix is 095°T, 1.7 nm from Heron Point Light. You steer 323°T at 8.6 kn through the water. At 1015 a new fix puts you 085°T, 1.3 nm from Westfield church spire.

   Plot the 1015 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 0925 your fix is 353°T, 1.1 nm from Gannet Rock daybeacon. You steer 240°T at 5.4 kn through the water. At 1015 a new fix puts you 004°T, 2.9 nm from Mill stack.

   Plot the 1015 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