Worksheet 105 · Skill 5

Set and drift

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1. At 1220 your fix is 273°T, 1.6 nm from Gannet Rock daybeacon. You steer 310°T at 4.8 kn through the water. At 1330 a new fix puts you 294°T, 4.4 nm from Tern Island tower.

   Plot the 1330 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  

2. At 1430 your fix is 346°T, 1.9 nm from Tern Island tower. You steer 250°T at 7.5 kn through the water. At 1510 a new fix puts you 055°T, 2.8 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1205 your fix is 000°T, 1.2 nm from Heron Point Light. You steer 003°T at 7.2 kn through the water. At 1250 a new fix puts you 017°T, 3.6 nm from Westfield church spire.

   Plot the 1250 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1410 your fix is 129°T, 1.8 nm from Westfield church spire. You steer 048°T at 5.6 kn through the water. At 1450 a new fix puts you 288°T, 3.8 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1045 your fix is 031°T, 3.8 nm from Westfield church spire. You steer 160°T at 5.2 kn through the water. At 1140 a new fix puts you 219°T, 2.7 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1200 your fix is 216°T, 3.4 nm from Tern Island tower. You steer 298°T at 5.4 kn through the water. At 1250 a new fix puts you 072°T, 2.4 nm from Westfield church spire.

   Plot the 1250 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 0720 your fix is 301°T, 4.6 nm from Tern Island tower. You steer 184°T at 4.5 kn through the water. At 0805 a new fix puts you 095°T, 1.7 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0830 your fix is 114°T, 1.7 nm from Tern Island tower. You steer 030°T at 7.5 kn through the water. At 0900 a new fix puts you 061°T, 4.3 nm from Tern Island tower.

   Plot the 0900 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