Worksheet 343 · Skill 5

Set and drift

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1. At 0715 your fix is 020°T, 2.6 nm from Westfield church spire. You steer 125°T at 6.0 kn through the water. At 0840 a new fix puts you 289°T, 2.4 nm from Kittle water tank.

   Plot the 0840 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  

2. At 0930 your fix is 288°T, 3.2 nm from Tern Island tower. You steer 136°T at 5.4 kn through the water. At 1045 a new fix puts you 223°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1045 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1015 your fix is 334°T, 1.2 nm from Heron Point Light. You steer 358°T at 4.3 kn through the water. At 1135 a new fix puts you 017°T, 2.8 nm from Westfield church spire.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0945 your fix is 306°T, 4.0 nm from Tern Island tower. You steer 092°T at 5.8 kn through the water. At 1030 a new fix puts you 051°T, 3.8 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1345 your fix is 049°T, 1.3 nm from Kittle water tank. You steer 341°T at 4.7 kn through the water. At 1430 a new fix puts you 134°T, 2.8 nm from Tern Island tower.

   Plot the 1430 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 1245 your fix is 304°T, 3.2 nm from Tern Island tower. You steer 102°T at 7.8 kn through the water. At 1330 a new fix puts you 045°T, 4.2 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1335 your fix is 215°T, 2.2 nm from Tern Island tower. You steer 340°T at 4.9 kn through the water. At 1425 a new fix puts you 299°T, 4.2 nm from Tern Island tower.

   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  

8. At 1100 your fix is 327°T, 2.4 nm from Tern Island tower. You steer 229°T at 4.7 kn through the water. At 1210 a new fix puts you 060°T, 2.5 nm from Westfield church spire.

   Plot the 1210 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