Worksheet 260 · Skill 5

Set and drift

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1. At 1405 your fix is 028°T, 2.6 nm from Westfield church spire. You steer 161°T at 6.1 kn through the water. At 1500 a new fix puts you 034°T, 1.7 nm from Heron Point Light.

   Plot the 1500 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  

2. At 1230 your fix is 102°T, 1.5 nm from Westfield church spire. You steer 111°T at 4.9 kn through the water. At 1355 a new fix puts you 203°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1355 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1135 your fix is 017°T, 1.3 nm from Heron Point Light. You steer 032°T at 6.3 kn through the water. At 1210 a new fix puts you 251°T, 3.6 nm from Tern Island tower.

   Plot the 1210 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 1330 your fix is 262°T, 2.3 nm from Tern Island tower. You steer 203°T at 7.3 kn through the water. At 1405 a new fix puts you 101°T, 1.8 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1030 your fix is 124°T, 1.5 nm from Gannet Rock daybeacon. You steer 001°T at 5.2 kn through the water. At 1105 a new fix puts you 019°T, 2.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1455 your fix is 027°T, 2.9 nm from Heron Point Light. You steer 107°T at 8.7 kn through the water. At 1540 a new fix puts you 352°T, 1.2 nm from Kittle water tank.

   Plot the 1540 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  

7. At 0905 your fix is 026°T, 1.7 nm from Gannet Rock daybeacon. You steer 185°T at 4.8 kn through the water. At 0950 a new fix puts you 038°T, 1.0 nm from Kittle water tank.

   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 1035 your fix is 042°T, 4.0 nm from Gannet Rock daybeacon. You steer 204°T at 5.8 kn through the water. At 1105 a new fix puts you 058°T, 2.1 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn