Worksheet 148 · Skill 5

Set and drift

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1. At 1230 your fix is 142°T, 1.6 nm from Westfield church spire. You steer 100°T at 4.6 kn through the water. At 1315 a new fix puts you 340°T, 2.8 nm from Mill stack.

   Plot the 1315 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 1255 your fix is 048°T, 2.3 nm from Mill stack. You steer 320°T at 5.5 kn through the water. At 1425 a new fix puts you 050°T, 1.5 nm from Westfield church spire.

   Plot the 1425 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  

3. At 1330 your fix is 282°T, 3.6 nm from Tern Island tower. You steer 176°T at 6.5 kn through the water. At 1400 a new fix puts you 046°T, 3.3 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1150 your fix is 056°T, 2.3 nm from Tern Island tower. You steer 289°T at 5.7 kn through the water. At 1225 a new fix puts you 320°T, 2.2 nm from Tern Island tower.

   Plot the 1225 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  

5. At 1435 your fix is 034°T, 1.4 nm from Tern Island tower. You steer 128°T at 8.4 kn through the water. At 1510 a new fix puts you 073°T, 1.9 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0905 your fix is 260°T, 2.6 nm from Tern Island tower. You steer 158°T at 7.3 kn through the water. At 0940 a new fix puts you 014°T, 1.5 nm from Mill stack.

   Plot the 0940 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 1250 your fix is 032°T, 3.9 nm from Westfield church spire. You steer 135°T at 8.7 kn through the water. At 1345 a new fix puts you 277°T, 1.2 nm from Gannet Rock daybeacon.

   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  

8. At 1525 your fix is 209°T, 2.8 nm from Tern Island tower. You steer 300°T at 6.3 kn through the water. At 1605 a new fix puts you 065°T, 3.0 nm from Westfield church spire.

   Plot the 1605 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