Worksheet 35 · Skill 5

Set and drift

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1. At 0840 your fix is 001°T, 2.1 nm from Mill stack. You steer 051°T at 6.3 kn through the water. At 0945 a new fix puts you 038°T, 4.9 nm from Gannet Rock daybeacon.

   Plot the 0945 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  

2. At 1255 your fix is 057°T, 1.3 nm from Westfield church spire. You steer 113°T at 6.6 kn through the water. At 1425 a new fix puts you 038°T, 2.1 nm from Kittle water tank.

   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 1310 your fix is 065°T, 2.1 nm from Westfield church spire. You steer 175°T at 4.4 kn through the water. At 1345 a new fix puts you 141°T, 1.4 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1430 your fix is 051°T, 3.2 nm from Westfield church spire. You steer 138°T at 4.6 kn through the water. At 1530 a new fix puts you 046°T, 2.2 nm from Heron Point Light.

   Plot the 1530 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  

5. At 1255 your fix is 209°T, 2.5 nm from Tern Island tower. You steer 298°T at 5.3 kn through the water. At 1400 a new fix puts you 010°T, 1.0 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1325 your fix is 243°T, 2.5 nm from Tern Island tower. You steer 215°T at 4.1 kn through the water. At 1410 a new fix puts you 054°T, 2.0 nm from Heron Point Light.

   Plot the 1410 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  

7. At 1050 your fix is 207°T, 2.8 nm from Tern Island tower. You steer 057°T at 7.8 kn through the water. At 1135 a new fix puts you 042°T, 4.4 nm from Gannet Rock daybeacon.

   Plot the 1135 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  

8. At 1000 your fix is 337°T, 1.9 nm from Tern Island tower. You steer 227°T at 4.0 kn through the water. At 1120 a new fix puts you 038°T, 3.6 nm from Heron Point Light.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn