Worksheet 890 · Skill 5

Set and drift

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1. At 1110 your fix is 031°T, 1.8 nm from Westfield church spire. You steer 143°T at 4.1 kn through the water. At 1240 a new fix puts you 078°T, 1.8 nm from Heron Point Light.

   Plot the 1240 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  

2. At 0720 your fix is 304°T, 1.2 nm from Tern Island tower. You steer 057°T at 4.4 kn through the water. At 0800 a new fix puts you 043°T, 3.5 nm from Tern Island tower.

   Plot the 0800 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 1525 your fix is 042°T, 2.8 nm from Heron Point Light. You steer 084°T at 6.2 kn through the water. At 1620 a new fix puts you 073°T, 2.2 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0735 your fix is 213°T, 2.5 nm from Tern Island tower. You steer 160°T at 4.7 kn through the water. At 0815 a new fix puts you 047°T, 2.3 nm from Mill stack.

   Plot the 0815 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 1435 your fix is 278°T, 1.6 nm from Gannet Rock daybeacon. You steer 307°T at 7.5 kn through the water. At 1510 a new fix puts you 275°T, 3.0 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0850 your fix is 031°T, 2.1 nm from Gannet Rock daybeacon. You steer 241°T at 7.2 kn through the water. At 0920 a new fix puts you 273°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0920 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  

7. At 0905 your fix is 055°T, 2.1 nm from Westfield church spire. You steer 136°T at 5.5 kn through the water. At 0950 a new fix puts you 225°T, 3.4 nm from Tern Island tower.

   Plot the 0950 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 1410 your fix is 073°T, 4.4 nm from Tern Island tower. You steer 217°T at 8.3 kn through the water. At 1440 a new fix puts you 348°T, 3.3 nm from Kittle water tank.

   Plot the 1440 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