Worksheet 224 · Skill 5

Set and drift

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1. At 1020 your fix is 217°T, 2.4 nm from Tern Island tower. You steer 121°T at 5.2 kn through the water. At 1110 a new fix puts you 197°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1110 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  

2. At 1310 your fix is 352°T, 1.6 nm from Gannet Rock daybeacon. You steer 147°T at 5.3 kn through the water. At 1350 a new fix puts you 042°T, 1.3 nm from Kittle water tank.

   Plot the 1350 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 1025 your fix is 210°T, 2.8 nm from Tern Island tower. You steer 284°T at 6.3 kn through the water. At 1100 a new fix puts you 028°T, 3.4 nm from Heron Point Light.

   Plot the 1100 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 1000 your fix is 288°T, 2.4 nm from Tern Island tower. You steer 173°T at 5.6 kn through the water. At 1040 a new fix puts you 207°T, 2.0 nm from Tern Island tower.

   Plot the 1040 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 1005 your fix is 285°T, 3.1 nm from Tern Island tower. You steer 162°T at 6.8 kn through the water. At 1035 a new fix puts you 204°T, 2.2 nm from Tern Island tower.

   Plot the 1035 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 1010 your fix is 300°T, 3.4 nm from Tern Island tower. You steer 083°T at 4.8 kn through the water. At 1105 a new fix puts you 014°T, 2.6 nm from Tern Island tower.

   Plot the 1105 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  

7. At 1105 your fix is 358°T, 2.6 nm from Mill stack. You steer 308°T at 4.3 kn through the water. At 1225 a new fix puts you 103°T, 1.2 nm from Westfield church spire.

   Plot the 1225 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1520 your fix is 349°T, 1.6 nm from Mill stack. You steer 325°T at 5.3 kn through the water. At 1600 a new fix puts you 027°T, 2.2 nm from Heron Point Light.

   Plot the 1600 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