Worksheet 904 · Skill 5

Set and drift

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1. At 0710 your fix is 156°T, 2.7 nm from Tern Island tower. You steer 217°T at 5.0 kn through the water. At 0750 a new fix puts you 023°T, 1.9 nm from Mill stack.

   Plot the 0750 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  

2. At 1400 your fix is 103°T, 1.0 nm from Westfield church spire. You steer 028°T at 5.0 kn through the water. At 1450 a new fix puts you 297°T, 4.2 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1540 your fix is 043°T, 3.1 nm from Westfield church spire. You steer 197°T at 5.3 kn through the water. At 1630 a new fix puts you 087°T, 0.9 nm from Westfield church spire.

   Plot the 1630 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  

4. At 1510 your fix is 032°T, 2.6 nm from Heron Point Light. You steer 041°T at 7.0 kn through the water. At 1540 a new fix puts you 263°T, 2.2 nm from Tern Island tower.

   Plot the 1540 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  

5. At 1120 your fix is 354°T, 1.7 nm from Heron Point Light. You steer 020°T at 5.3 kn through the water. At 1225 a new fix puts you 284°T, 3.9 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0740 your fix is 015°T, 2.0 nm from Mill stack. You steer 051°T at 4.8 kn through the water. At 0820 a new fix puts you 266°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0820 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 1155 your fix is 106°T, 2.6 nm from Westfield church spire. You steer 120°T at 6.7 kn through the water. At 1245 a new fix puts you 242°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1245 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 1250 your fix is 062°T, 2.4 nm from Gannet Rock daybeacon. You steer 264°T at 6.5 kn through the water. At 1320 a new fix puts you 152°T, 1.5 nm from Tern Island tower.

   Plot the 1320 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