Worksheet 598 · Skill 5

Set and drift

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1. At 0750 your fix is 023°T, 2.7 nm from Heron Point Light. You steer 113°T at 6.6 kn through the water. At 0850 a new fix puts you 356°T, 0.9 nm from Kittle water tank.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1520 your fix is 337°T, 1.3 nm from Kittle water tank. You steer 305°T at 6.2 kn through the water. At 1630 a new fix puts you 257°T, 3.3 nm from Tern Island tower.

   Plot the 1630 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1215 your fix is 326°T, 2.6 nm from Tern Island tower. You steer 242°T at 4.6 kn through the water. At 1255 a new fix puts you 276°T, 3.1 nm from Tern Island tower.

   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  

4. At 1440 your fix is 071°T, 4.0 nm from Tern Island tower. You steer 283°T at 4.2 kn through the water. At 1510 a new fix puts you 044°T, 2.0 nm from Tern Island tower.

   Plot the 1510 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 0825 your fix is 349°T, 1.5 nm from Kittle water tank. You steer 271°T at 4.9 kn through the water. At 0950 a new fix puts you 352°T, 3.1 nm from Mill stack.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1250 your fix is 325°T, 1.4 nm from Kittle water tank. You steer 001°T at 5.3 kn through the water. At 1355 a new fix puts you 039°T, 3.9 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1515 your fix is 058°T, 3.6 nm from Westfield church spire. You steer 126°T at 5.0 kn through the water. At 1630 a new fix puts you 196°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1630 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1025 your fix is 037°T, 2.8 nm from Gannet Rock daybeacon. You steer 198°T at 4.5 kn through the water. At 1100 a new fix puts you 101°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1100 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