Worksheet 243 · Skill 5

Set and drift

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1. At 0940 your fix is 217°T, 2.3 nm from Tern Island tower. You steer 076°T at 4.7 kn through the water. At 1015 a new fix puts you 156°T, 1.5 nm from Tern Island tower.

   Plot the 1015 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 1325 your fix is 041°T, 4.1 nm from Gannet Rock daybeacon. You steer 289°T at 5.4 kn through the water. At 1400 a new fix puts you 047°T, 2.5 nm from Tern Island tower.

   Plot the 1400 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  

3. At 1405 your fix is 207°T, 2.2 nm from Tern Island tower. You steer 320°T at 8.3 kn through the water. At 1435 a new fix puts you 303°T, 3.9 nm from Tern Island tower.

   Plot the 1435 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  

4. At 0750 your fix is 255°T, 1.9 nm from Tern Island tower. You steer 265°T at 6.7 kn through the water. At 0825 a new fix puts you 106°T, 1.5 nm from Westfield church spire.

   Plot the 0825 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 0710 your fix is 089°T, 1.6 nm from Heron Point Light. You steer 336°T at 4.8 kn through the water. At 0825 a new fix puts you 027°T, 3.6 nm from Westfield church spire.

   Plot the 0825 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  

6. At 1015 your fix is 024°T, 3.0 nm from Heron Point Light. You steer 325°T at 6.2 kn through the water. At 1050 a new fix puts you 049°T, 1.6 nm from Westfield church spire.

   Plot the 1050 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  

7. At 1320 your fix is 084°T, 1.4 nm from Westfield church spire. You steer 061°T at 6.6 kn through the water. At 1355 a new fix puts you 291°T, 3.6 nm from Tern Island tower.

   Plot the 1355 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 1405 your fix is 333°T, 2.1 nm from Mill stack. You steer 303°T at 4.0 kn through the water. At 1510 a new fix puts you 081°T, 3.3 nm from Westfield church spire.

   Plot the 1510 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