Worksheet 749 · Skill 5

Set and drift

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1. At 0735 your fix is 224°T, 1.9 nm from Gannet Rock daybeacon. You steer 077°T at 5.4 kn through the water. At 0805 a new fix puts you 001°T, 1.1 nm from Kittle water tank.

   Plot the 0805 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  

2. At 1000 your fix is 007°T, 1.9 nm from Westfield church spire. You steer 087°T at 5.5 kn through the water. At 1030 a new fix puts you 049°T, 3.2 nm from Westfield church spire.

   Plot the 1030 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  

3. At 1210 your fix is 219°T, 1.0 nm from Gannet Rock daybeacon. You steer 292°T at 4.8 kn through the water. At 1250 a new fix puts you 233°T, 1.8 nm from Tern Island tower.

   Plot the 1250 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 1220 your fix is 332°T, 1.7 nm from Tern Island tower. You steer 212°T at 7.7 kn through the water. At 1250 a new fix puts you 240°T, 3.0 nm from Tern Island tower.

   Plot the 1250 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  

5. At 1535 your fix is 048°T, 2.5 nm from Westfield church spire. You steer 147°T at 6.2 kn through the water. At 1610 a new fix puts you 060°T, 2.8 nm from Heron Point Light.

   Plot the 1610 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 0925 your fix is 036°T, 4.7 nm from Gannet Rock daybeacon. You steer 212°T at 6.0 kn through the water. At 0955 a new fix puts you 063°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0955 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  

7. At 0725 your fix is 079°T, 2.3 nm from Tern Island tower. You steer 177°T at 5.9 kn through the water. At 0805 a new fix puts you 213°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0805 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 1245 your fix is 033°T, 2.0 nm from Westfield church spire. You steer 145°T at 5.4 kn through the water. At 1325 a new fix puts you 031°T, 1.8 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn