Worksheet 851 · Skill 5

Set and drift

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1. At 1420 your fix is 037°T, 1.3 nm from Heron Point Light. You steer 090°T at 4.2 kn through the water. At 1520 a new fix puts you 294°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1520 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1120 your fix is 295°T, 2.6 nm from Tern Island tower. You steer 217°T at 5.3 kn through the water. At 1210 a new fix puts you 051°T, 3.0 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0810 your fix is 006°T, 1.0 nm from Kittle water tank. You steer 283°T at 8.6 kn through the water. At 0850 a new fix puts you 349°T, 2.4 nm from Mill stack.

   Plot the 0850 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  

4. At 0755 your fix is 224°T, 1.6 nm from Gannet Rock daybeacon. You steer 065°T at 4.5 kn through the water. At 0830 a new fix puts you 343°T, 2.9 nm from Kittle water tank.

   Plot the 0830 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 1320 your fix is 060°T, 3.1 nm from Westfield church spire. You steer 158°T at 6.0 kn through the water. At 1405 a new fix puts you 034°T, 2.8 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0805 your fix is 203°T, 2.7 nm from Tern Island tower. You steer 263°T at 4.6 kn through the water. At 0840 a new fix puts you 040°T, 3.6 nm from Heron Point Light.

   Plot the 0840 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  

7. At 1420 your fix is 179°T, 1.7 nm from Gannet Rock daybeacon. You steer 274°T at 5.9 kn through the water. At 1515 a new fix puts you 090°T, 2.1 nm from Heron Point Light.

   Plot the 1515 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  

8. At 1415 your fix is 124°T, 1.7 nm from Westfield church spire. You steer 096°T at 4.0 kn through the water. At 1505 a new fix puts you 016°T, 2.6 nm from Mill stack.

   Plot the 1505 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