Worksheet 167 · Skill 5

Set and drift

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1. At 1410 your fix is 046°T, 3.0 nm from Gannet Rock daybeacon. You steer 195°T at 4.0 kn through the water. At 1515 a new fix puts you 160°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1515 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  

2. At 0735 your fix is 109°T, 1.6 nm from Tern Island tower. You steer 185°T at 7.0 kn through the water. At 0805 a new fix puts you 236°T, 1.6 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1455 your fix is 062°T, 1.0 nm from Westfield church spire. You steer 124°T at 7.7 kn through the water. At 1530 a new fix puts you 047°T, 3.3 nm from Heron Point Light.

   Plot the 1530 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 1450 your fix is 322°T, 0.8 nm from Gannet Rock daybeacon. You steer 260°T at 4.2 kn through the water. At 1550 a new fix puts you 220°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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1110 your fix is 079°T, 2.5 nm from Tern Island tower. You steer 141°T at 4.0 kn through the water. At 1150 a new fix puts you 099°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1150 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 1405 your fix is 039°T, 2.6 nm from Tern Island tower. You steer 255°T at 4.7 kn through the water. At 1535 a new fix puts you 022°T, 2.3 nm from Westfield church spire.

   Plot the 1535 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1050 your fix is 022°T, 1.4 nm from Tern Island tower. You steer 115°T at 6.0 kn through the water. At 1140 a new fix puts you 035°T, 2.9 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1445 your fix is 027°T, 1.0 nm from Gannet Rock daybeacon. You steer 033°T at 7.3 kn through the water. At 1520 a new fix puts you 038°T, 4.1 nm from Gannet Rock daybeacon.

   Plot the 1520 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