Worksheet 373 · Skill 5

Set and drift

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1. At 1215 your fix is 222°T, 2.0 nm from Gannet Rock daybeacon. You steer 087°T at 6.0 kn through the water. At 1255 a new fix puts you 047°T, 1.7 nm from Kittle water tank.

   Plot the 1255 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  

2. At 1120 your fix is 031°T, 3.1 nm from Gannet Rock daybeacon. You steer 220°T at 7.9 kn through the water. At 1205 a new fix puts you 023°T, 2.7 nm from Mill stack.

   Plot the 1205 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  

3. At 1320 your fix is 234°T, 3.3 nm from Tern Island tower. You steer 325°T at 8.4 kn through the water. At 1350 a new fix puts you 044°T, 4.5 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0940 your fix is 045°T, 3.0 nm from Tern Island tower. You steer 133°T at 6.0 kn through the water. At 1020 a new fix puts you 056°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1020 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 0805 your fix is 000°T, 2.3 nm from Mill stack. You steer 296°T at 5.5 kn through the water. At 0900 a new fix puts you 143°T, 1.4 nm from Westfield church spire.

   Plot the 0900 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  

6. At 0805 your fix is 045°T, 2.1 nm from Heron Point Light. You steer 093°T at 4.5 kn through the water. At 0900 a new fix puts you 182°T, 1.4 nm from Tern Island tower.

   Plot the 0900 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 1210 your fix is 031°T, 2.5 nm from Mill stack. You steer 337°T at 7.2 kn through the water. At 1300 a new fix puts you 052°T, 3.4 nm from Westfield church spire.

   Plot the 1300 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  

8. At 0955 your fix is 002°T, 1.4 nm from Gannet Rock daybeacon. You steer 233°T at 8.4 kn through the water. At 1025 a new fix puts you 030°T, 2.5 nm from Mill stack.

   Plot the 1025 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