Worksheet 795 · Skill 5

Set and drift

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1. At 0800 your fix is 298°T, 3.2 nm from Tern Island tower. You steer 268°T at 4.3 kn through the water. At 0850 a new fix puts you 033°T, 4.3 nm from Westfield church spire.

   Plot the 0850 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  

2. At 1545 your fix is 082°T, 3.7 nm from Westfield church spire. You steer 337°T at 4.1 kn through the water. At 1620 a new fix puts you 044°T, 2.9 nm from Westfield church spire.

   Plot the 1620 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 1205 your fix is 035°T, 2.0 nm from Westfield church spire. You steer 167°T at 4.3 kn through the water. At 1300 a new fix puts you 111°T, 2.3 nm from Westfield church spire.

   Plot the 1300 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  

4. At 1125 your fix is 007°T, 2.9 nm from Westfield church spire. You steer 127°T at 8.6 kn through the water. At 1215 a new fix puts you 224°T, 2.2 nm from Tern Island tower.

   Plot the 1215 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  

5. At 0700 your fix is 020°T, 2.2 nm from Westfield church spire. You steer 162°T at 4.9 kn through the water. At 0800 a new fix puts you 080°T, 0.8 nm from Heron Point Light.

   Plot the 0800 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  

6. At 1250 your fix is 351°T, 3.0 nm from Mill stack. You steer 315°T at 4.9 kn through the water. At 1405 a new fix puts you 359°T, 2.1 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1140 your fix is 350°T, 2.6 nm from Mill stack. You steer 065°T at 8.6 kn through the water. At 1215 a new fix puts you 348°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1215 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  

8. At 0800 your fix is 029°T, 2.5 nm from Westfield church spire. You steer 122°T at 5.4 kn through the water. At 0850 a new fix puts you 255°T, 3.3 nm from Tern Island tower.

   Plot the 0850 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