Worksheet 800 · Skill 5

Set and drift

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1. At 1500 your fix is 151°T, 1.6 nm from Westfield church spire. You steer 052°T at 5.9 kn through the water. At 1610 a new fix puts you 313°T, 2.8 nm from Tern Island tower.

   Plot the 1610 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1355 your fix is 073°T, 3.1 nm from Tern Island tower. You steer 140°T at 6.1 kn through the water. At 1425 a new fix puts you 070°T, 2.7 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1300 your fix is 036°T, 1.5 nm from Westfield church spire. You steer 067°T at 4.4 kn through the water. At 1405 a new fix puts you 006°T, 2.6 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0915 your fix is 079°T, 3.4 nm from Westfield church spire. You steer 018°T at 5.1 kn through the water. At 0950 a new fix puts you 301°T, 4.5 nm from Tern Island tower.

   Plot the 0950 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  

5. At 1435 your fix is 215°T, 2.8 nm from Tern Island tower. You steer 103°T at 5.8 kn through the water. At 1520 a new fix puts you 185°T, 1.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1055 your fix is 305°T, 1.4 nm from Gannet Rock daybeacon. You steer 081°T at 4.3 kn through the water. At 1135 a new fix puts you 071°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1135 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  

7. At 1200 your fix is 308°T, 4.0 nm from Tern Island tower. You steer 246°T at 6.6 kn through the water. At 1235 a new fix puts you 048°T, 1.2 nm from Westfield church spire.

   Plot the 1235 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 1300 your fix is 119°T, 2.0 nm from Westfield church spire. You steer 052°T at 4.0 kn through the water. At 1350 a new fix puts you 061°T, 3.4 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn