Worksheet 304 · Skill 5

Set and drift

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1. At 1235 your fix is 009°T, 2.0 nm from Westfield church spire. You steer 106°T at 5.2 kn through the water. At 1305 a new fix puts you 087°T, 3.4 nm from Westfield church spire.

   Plot the 1305 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 1320 your fix is 240°T, 2.2 nm from Tern Island tower. You steer 145°T at 6.9 kn through the water. At 1355 a new fix puts you 212°T, 1.7 nm from Gannet Rock daybeacon.

   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  

3. At 0730 your fix is 231°T, 1.9 nm from Gannet Rock daybeacon. You steer 314°T at 7.7 kn through the water. At 0805 a new fix puts you 076°T, 3.5 nm from Westfield church spire.

   Plot the 0805 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  

4. At 1435 your fix is 027°T, 3.2 nm from Heron Point Light. You steer 104°T at 5.0 kn through the water. At 1550 a new fix puts you 201°T, 2.2 nm from Tern Island tower.

   Plot the 1550 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  

5. At 1100 your fix is 319°T, 1.4 nm from Gannet Rock daybeacon. You steer 252°T at 8.4 kn through the water. At 1140 a new fix puts you 021°T, 1.8 nm from Heron Point Light.

   Plot the 1140 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  

6. At 1530 your fix is 084°T, 1.9 nm from Westfield church spire. You steer 046°T at 4.3 kn through the water. At 1620 a new fix puts you 051°T, 4.1 nm from Westfield church spire.

   Plot the 1620 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  

7. At 1510 your fix is 049°T, 2.7 nm from Tern Island tower. You steer 153°T at 4.8 kn through the water. At 1620 a new fix puts you 342°T, 2.9 nm from Kittle water tank.

   Plot the 1620 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  

8. At 1245 your fix is 055°T, 3.5 nm from Tern Island tower. You steer 191°T at 5.4 kn through the water. At 1325 a new fix puts you 049°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1325 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