Worksheet 801 · Skill 5

Set and drift

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1. At 1430 your fix is 338°T, 0.9 nm from Heron Point Light. You steer 079°T at 4.9 kn through the water. At 1515 a new fix puts you 058°T, 3.0 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1200 your fix is 224°T, 2.5 nm from Tern Island tower. You steer 273°T at 6.0 kn through the water. At 1235 a new fix puts you 096°T, 1.3 nm from Westfield church spire.

   Plot the 1235 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 0900 your fix is 264°T, 1.1 nm from Gannet Rock daybeacon. You steer 290°T at 8.0 kn through the water. At 0940 a new fix puts you 069°T, 1.9 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0755 your fix is 270°T, 1.2 nm from Gannet Rock daybeacon. You steer 282°T at 4.0 kn through the water. At 0905 a new fix puts you 284°T, 3.8 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1305 your fix is 002°T, 2.6 nm from Westfield church spire. You steer 100°T at 7.4 kn through the water. At 1355 a new fix puts you 308°T, 2.8 nm from Tern Island tower.

   Plot the 1355 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 0845 your fix is 204°T, 1.6 nm from Tern Island tower. You steer 270°T at 4.2 kn through the water. At 0950 a new fix puts you 079°T, 2.4 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0715 your fix is 016°T, 2.1 nm from Heron Point Light. You steer 122°T at 8.8 kn through the water. At 0745 a new fix puts you 337°T, 0.9 nm from Mill stack.

   Plot the 0745 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 0745 your fix is 042°T, 3.3 nm from Heron Point Light. You steer 026°T at 8.1 kn through the water. At 0820 a new fix puts you 332°T, 2.1 nm from Tern Island tower.

   Plot the 0820 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