Worksheet 631 · Skill 5

Set and drift

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1. At 0715 your fix is 051°T, 3.9 nm from Westfield church spire. You steer 173°T at 5.3 kn through the water. At 0755 a new fix puts you 101°T, 2.7 nm from Westfield church spire.

   Plot the 0755 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  

2. At 1415 your fix is 059°T, 2.3 nm from Westfield church spire. You steer 157°T at 7.6 kn through the water. At 1445 a new fix puts you 049°T, 2.4 nm from Heron Point Light.

   Plot the 1445 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  

3. At 0720 your fix is 287°T, 2.2 nm from Tern Island tower. You steer 228°T at 5.5 kn through the water. At 0800 a new fix puts you 046°T, 2.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1000 your fix is 011°T, 2.1 nm from Mill stack. You steer 299°T at 6.4 kn through the water. At 1030 a new fix puts you 025°T, 1.3 nm from Heron Point Light.

   Plot the 1030 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 1325 your fix is 300°T, 3.8 nm from Tern Island tower. You steer 163°T at 5.7 kn through the water. At 1405 a new fix puts you 040°T, 3.3 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0910 your fix is 306°T, 1.4 nm from Gannet Rock daybeacon. You steer 056°T at 6.8 kn through the water. At 0945 a new fix puts you 074°T, 3.2 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1315 your fix is 022°T, 1.3 nm from Tern Island tower. You steer 265°T at 7.1 kn through the water. At 1400 a new fix puts you 050°T, 2.8 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0715 your fix is 280°T, 2.1 nm from Gannet Rock daybeacon. You steer 271°T at 5.9 kn through the water. At 0810 a new fix puts you 032°T, 2.0 nm from Heron Point Light.

   Plot the 0810 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