Worksheet 933 · Skill 5

Set and drift

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1. At 0700 your fix is 039°T, 1.3 nm from Westfield church spire. You steer 042°T at 5.9 kn through the water. At 0730 a new fix puts you 047°T, 4.4 nm from Westfield church spire.

   Plot the 0730 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  

2. At 1135 your fix is 262°T, 2.4 nm from Gannet Rock daybeacon. You steer 098°T at 4.9 kn through the water. At 1205 a new fix puts you 236°T, 0.8 nm from Gannet Rock daybeacon.

   Plot the 1205 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 1245 your fix is 336°T, 1.5 nm from Gannet Rock daybeacon. You steer 255°T at 6.9 kn through the water. At 1350 a new fix puts you 017°T, 0.8 nm from Heron Point Light.

   Plot the 1350 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 1405 your fix is 101°T, 2.3 nm from Gannet Rock daybeacon. You steer 326°T at 7.5 kn through the water. At 1435 a new fix puts you 101°T, 1.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1515 your fix is 001°T, 2.5 nm from Westfield church spire. You steer 130°T at 4.7 kn through the water. At 1545 a new fix puts you 085°T, 2.2 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1430 your fix is 058°T, 3.1 nm from Heron Point Light. You steer 088°T at 4.2 kn through the water. At 1520 a new fix puts you 250°T, 2.3 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1125 your fix is 319°T, 1.3 nm from Gannet Rock daybeacon. You steer 222°T at 7.2 kn through the water. At 1200 a new fix puts you 011°T, 1.7 nm from Mill stack.

   Plot the 1200 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 1600 your fix is 359°T, 1.8 nm from Tern Island tower. You steer 111°T at 6.7 kn through the water. At 1630 a new fix puts you 065°T, 3.1 nm from Tern Island tower.

   Plot the 1630 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