Worksheet 610 · Skill 5

Set and drift

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1. At 0715 your fix is 031°T, 3.9 nm from Westfield church spire. You steer 189°T at 6.4 kn through the water. At 0750 a new fix puts you 118°T, 1.7 nm from Westfield church spire.

   Plot the 0750 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  

2. At 1120 your fix is 053°T, 2.4 nm from Westfield church spire. You steer 140°T at 4.8 kn through the water. At 1245 a new fix puts you 239°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1245 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 109°T, 1.8 nm from Gannet Rock daybeacon. You steer 244°T at 4.5 kn through the water. At 1230 a new fix puts you 192°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1230 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 1220 your fix is 045°T, 4.1 nm from Westfield church spire. You steer 088°T at 5.9 kn through the water. At 1325 a new fix puts you 042°T, 3.4 nm from Tern Island tower.

   Plot the 1325 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0740 your fix is 092°T, 1.8 nm from Gannet Rock daybeacon. You steer 254°T at 4.5 kn through the water. At 0820 a new fix puts you 193°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 0820 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  

6. At 1355 your fix is 138°T, 1.1 nm from Gannet Rock daybeacon. You steer 087°T at 4.4 kn through the water. At 1430 a new fix puts you 050°T, 2.4 nm from Kittle water tank.

   Plot the 1430 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 1425 your fix is 252°T, 2.6 nm from Gannet Rock daybeacon. You steer 305°T at 8.4 kn through the water. At 1505 a new fix puts you 049°T, 3.0 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0820 your fix is 157°T, 0.9 nm from Westfield church spire. You steer 105°T at 8.3 kn through the water. At 0920 a new fix puts you 036°T, 1.9 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn