Worksheet 359 · Skill 5

Set and drift

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1. At 1440 your fix is 346°T, 2.1 nm from Mill stack. You steer 339°T at 7.8 kn through the water. At 1515 a new fix puts you 268°T, 2.6 nm from Tern Island tower.

   Plot the 1515 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  

2. At 1425 your fix is 268°T, 1.8 nm from Tern Island tower. You steer 315°T at 4.6 kn through the water. At 1505 a new fix puts you 300°T, 4.2 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1510 your fix is 281°T, 1.4 nm from Tern Island tower. You steer 270°T at 5.0 kn through the water. At 1600 a new fix puts you 081°T, 2.4 nm from Westfield church spire.

   Plot the 1600 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 0905 your fix is 000°T, 1.6 nm from Mill stack. You steer 291°T at 4.1 kn through the water. At 1010 a new fix puts you 042°T, 2.4 nm from Heron Point Light.

   Plot the 1010 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  

5. At 1510 your fix is 106°T, 1.1 nm from Westfield church spire. You steer 346°T at 5.1 kn through the water. At 1555 a new fix puts you 001°T, 2.2 nm from Westfield church spire.

   Plot the 1555 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 1425 your fix is 021°T, 0.9 nm from Heron Point Light. You steer 031°T at 4.6 kn through the water. At 1545 a new fix puts you 246°T, 2.3 nm from Tern Island tower.

   Plot the 1545 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  

7. At 1250 your fix is 003°T, 1.8 nm from Mill stack. You steer 046°T at 5.5 kn through the water. At 1410 a new fix puts you 067°T, 3.8 nm from Tern Island tower.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1230 your fix is 205°T, 2.5 nm from Tern Island tower. You steer 118°T at 6.8 kn through the water. At 1305 a new fix puts you 198°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1305 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