Worksheet 396 · Skill 5

Set and drift

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1. At 0915 your fix is 073°T, 2.3 nm from Heron Point Light. You steer 052°T at 7.6 kn through the water. At 0950 a new fix puts you 145°T, 2.4 nm from Tern Island tower.

   Plot the 0950 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 1400 your fix is 300°T, 3.4 nm from Tern Island tower. You steer 233°T at 5.9 kn through the water. At 1435 a new fix puts you 098°T, 2.1 nm from Westfield church spire.

   Plot the 1435 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  

3. At 1415 your fix is 045°T, 2.1 nm from Westfield church spire. You steer 155°T at 5.5 kn through the water. At 1520 a new fix puts you 358°T, 3.0 nm from Mill stack.

   Plot the 1520 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  

4. At 1040 your fix is 204°T, 1.8 nm from Tern Island tower. You steer 281°T at 7.7 kn through the water. At 1110 a new fix puts you 098°T, 3.1 nm from Westfield church spire.

   Plot the 1110 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 1025 your fix is 012°T, 2.5 nm from Westfield church spire. You steer 138°T at 8.7 kn through the water. At 1115 a new fix puts you 356°T, 2.6 nm from Mill stack.

   Plot the 1115 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 1255 your fix is 031°T, 2.6 nm from Mill stack. You steer 040°T at 7.3 kn through the water. At 1405 a new fix puts you 074°T, 4.1 nm from Tern Island tower.

   Plot the 1405 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  

7. At 1410 your fix is 195°T, 2.4 nm from Tern Island tower. You steer 219°T at 4.1 kn through the water. At 1455 a new fix puts you 353°T, 1.8 nm from Mill stack.

   Plot the 1455 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 0940 your fix is 048°T, 1.4 nm from Gannet Rock daybeacon. You steer 249°T at 5.9 kn through the water. At 1045 a new fix puts you 015°T, 2.6 nm from Heron Point Light.

   Plot the 1045 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