Worksheet 460 · Skill 5

Set and drift

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1. At 0905 your fix is 073°T, 2.5 nm from Westfield church spire. You steer 137°T at 6.2 kn through the water. At 0940 a new fix puts you 004°T, 3.1 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1550 your fix is 079°T, 3.2 nm from Westfield church spire. You steer 117°T at 5.0 kn through the water. At 1620 a new fix puts you 237°T, 2.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1230 your fix is 097°T, 1.4 nm from Westfield church spire. You steer 064°T at 4.0 kn through the water. At 1330 a new fix puts you 298°T, 3.0 nm from Tern Island tower.

   Plot the 1330 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  

4. At 1445 your fix is 353°T, 2.2 nm from Tern Island tower. You steer 237°T at 5.0 kn through the water. At 1605 a new fix puts you 159°T, 1.9 nm from Westfield church spire.

   Plot the 1605 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  

5. At 1520 your fix is 098°T, 1.9 nm from Westfield church spire. You steer 111°T at 6.9 kn through the water. At 1555 a new fix puts you 351°T, 2.4 nm from Mill stack.

   Plot the 1555 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  

6. At 1335 your fix is 204°T, 2.1 nm from Tern Island tower. You steer 091°T at 6.3 kn through the water. At 1425 a new fix puts you 081°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1425 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 0735 your fix is 289°T, 1.6 nm from Tern Island tower. You steer 173°T at 5.1 kn through the water. At 0830 a new fix puts you 200°T, 2.6 nm from Tern Island tower.

   Plot the 0830 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  

8. At 0835 your fix is 290°T, 4.1 nm from Tern Island tower. You steer 196°T at 6.0 kn through the water. At 0910 a new fix puts you 087°T, 2.5 nm from Westfield church spire.

   Plot the 0910 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