Worksheet 679 · Skill 5

Set and drift

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1. At 1555 your fix is 060°T, 3.1 nm from Heron Point Light. You steer 314°T at 7.3 kn through the water. At 1640 a new fix puts you 062°T, 1.4 nm from Westfield church spire.

   Plot the 1640 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 0810 your fix is 299°T, 1.1 nm from Gannet Rock daybeacon. You steer 267°T at 5.1 kn through the water. At 0935 a new fix puts you 052°T, 3.0 nm from Heron Point Light.

   Plot the 0935 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1530 your fix is 239°T, 2.3 nm from Gannet Rock daybeacon. You steer 334°T at 5.6 kn through the water. At 1635 a new fix puts you 300°T, 4.1 nm from Tern Island tower.

   Plot the 1635 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 1250 your fix is 086°T, 0.9 nm from Heron Point Light. You steer 309°T at 4.1 kn through the water. At 1335 a new fix puts you 133°T, 1.2 nm from Westfield church spire.

   Plot the 1335 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  

5. At 0735 your fix is 329°T, 2.5 nm from Tern Island tower. You steer 195°T at 7.3 kn through the water. At 0835 a new fix puts you 062°T, 3.2 nm from Heron Point Light.

   Plot the 0835 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 1005 your fix is 348°T, 2.3 nm from Tern Island tower. You steer 232°T at 4.6 kn through the water. At 1050 a new fix puts you 058°T, 3.8 nm from Westfield church spire.

   Plot the 1050 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  

7. At 1255 your fix is 035°T, 1.5 nm from Kittle water tank. You steer 279°T at 5.8 kn through the water. At 1415 a new fix puts you 090°T, 1.0 nm from Westfield church spire.

   Plot the 1415 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1355 your fix is 319°T, 1.7 nm from Kittle water tank. You steer 015°T at 6.7 kn through the water. At 1450 a new fix puts you 066°T, 4.5 nm from Tern Island tower.

   Plot the 1450 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