Worksheet 546 · Skill 5

Set and drift

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1. At 1130 your fix is 052°T, 1.1 nm from Heron Point Light. You steer 081°T at 4.6 kn through the water. At 1240 a new fix puts you 257°T, 1.9 nm from Gannet Rock daybeacon.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1050 your fix is 236°T, 1.9 nm from Tern Island tower. You steer 344°T at 5.8 kn through the water. At 1125 a new fix puts you 321°T, 2.4 nm from Tern Island tower.

   Plot the 1125 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 1545 your fix is 112°T, 1.9 nm from Gannet Rock daybeacon. You steer 011°T at 4.0 kn through the water. At 1615 a new fix puts you 058°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1615 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 1315 your fix is 051°T, 3.0 nm from Gannet Rock daybeacon. You steer 304°T at 6.2 kn through the water. At 1405 a new fix puts you 022°T, 1.9 nm from Tern Island tower.

   Plot the 1405 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  

5. At 1330 your fix is 041°T, 3.2 nm from Heron Point Light. You steer 308°T at 4.6 kn through the water. At 1400 a new fix puts you 093°T, 2.6 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0920 your fix is 352°T, 2.9 nm from Mill stack. You steer 093°T at 5.1 kn through the water. At 1010 a new fix puts you 290°T, 2.2 nm from Kittle water tank.

   Plot the 1010 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 0915 your fix is 020°T, 1.8 nm from Tern Island tower. You steer 256°T at 4.9 kn through the water. At 0950 a new fix puts you 281°T, 3.6 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1340 your fix is 119°T, 1.3 nm from Westfield church spire. You steer 129°T at 4.3 kn through the water. At 1425 a new fix puts you 033°T, 2.1 nm from Heron Point Light.

   Plot the 1425 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