Worksheet 609 · Skill 5

Set and drift

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1. At 1015 your fix is 082°T, 3.3 nm from Westfield church spire. You steer 081°T at 5.0 kn through the water. At 1045 a new fix puts you 254°T, 2.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1205 your fix is 241°T, 2.9 nm from Tern Island tower. You steer 204°T at 4.0 kn through the water. At 1255 a new fix puts you 303°T, 3.6 nm from Mill stack.

   Plot the 1255 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  

3. At 1200 your fix is 034°T, 2.2 nm from Mill stack. You steer 071°T at 5.4 kn through the water. At 1240 a new fix puts you 193°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1240 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  

4. At 0840 your fix is 214°T, 1.3 nm from Tern Island tower. You steer 249°T at 5.6 kn through the water. At 0930 a new fix puts you 092°T, 2.5 nm from Westfield church spire.

   Plot the 0930 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  

5. At 0720 your fix is 093°T, 2.7 nm from Westfield church spire. You steer 045°T at 5.7 kn through the water. At 0755 a new fix puts you 306°T, 3.4 nm from Tern Island tower.

   Plot the 0755 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 1125 your fix is 289°T, 1.5 nm from Tern Island tower. You steer 231°T at 5.4 kn through the water. At 1205 a new fix puts you 102°T, 2.0 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0750 your fix is 236°T, 1.8 nm from Tern Island tower. You steer 106°T at 6.8 kn through the water. At 0840 a new fix puts you 084°T, 3.0 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1110 your fix is 001°T, 2.5 nm from Mill stack. You steer 304°T at 4.8 kn through the water. At 1225 a new fix puts you 029°T, 1.5 nm from Westfield church spire.

   Plot the 1225 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