Worksheet 777 · Skill 5

Set and drift

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1. At 0750 your fix is 037°T, 1.9 nm from Gannet Rock daybeacon. You steer 172°T at 4.8 kn through the water. At 0835 a new fix puts you 018°T, 2.0 nm from Kittle water tank.

   Plot the 0835 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  

2. At 1245 your fix is 042°T, 2.6 nm from Heron Point Light. You steer 111°T at 6.7 kn through the water. At 1335 a new fix puts you 344°T, 1.2 nm from Kittle water tank.

   Plot the 1335 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 1250 your fix is 252°T, 3.1 nm from Tern Island tower. You steer 136°T at 4.4 kn through the water. At 1355 a new fix puts you 259°T, 1.4 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  

4. At 1115 your fix is 246°T, 2.6 nm from Tern Island tower. You steer 309°T at 5.3 kn through the water. At 1200 a new fix puts you 038°T, 3.7 nm from Westfield church spire.

   Plot the 1200 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  

5. At 0900 your fix is 080°T, 0.8 nm from Gannet Rock daybeacon. You steer 019°T at 6.2 kn through the water. At 0935 a new fix puts you 036°T, 4.6 nm from Gannet Rock daybeacon.

   Plot the 0935 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 1440 your fix is 014°T, 2.3 nm from Gannet Rock daybeacon. You steer 231°T at 5.3 kn through the water. At 1510 a new fix puts you 192°T, 2.2 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  

7. At 1525 your fix is 350°T, 2.2 nm from Mill stack. You steer 084°T at 4.6 kn through the water. At 1615 a new fix puts you 239°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1615 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 1600 your fix is 069°T, 3.7 nm from Westfield church spire. You steer 140°T at 6.8 kn through the water. At 1630 a new fix puts you 356°T, 3.1 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn