Worksheet 221 · Skill 5

Set and drift

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1. At 0850 your fix is 014°T, 1.6 nm from Gannet Rock daybeacon. You steer 212°T at 5.7 kn through the water. At 0920 a new fix puts you 240°T, 2.2 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1000 your fix is 024°T, 3.4 nm from Westfield church spire. You steer 146°T at 5.2 kn through the water. At 1105 a new fix puts you 024°T, 1.7 nm from Heron Point Light.

   Plot the 1105 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  

3. At 1200 your fix is 069°T, 2.6 nm from Heron Point Light. You steer 331°T at 8.1 kn through the water. At 1235 a new fix puts you 044°T, 3.6 nm from Westfield church spire.

   Plot the 1235 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  

4. At 0705 your fix is 301°T, 2.6 nm from Tern Island tower. You steer 221°T at 6.8 kn through the water. At 0755 a new fix puts you 149°T, 1.7 nm from Westfield church spire.

   Plot the 0755 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  

5. At 1415 your fix is 199°T, 2.4 nm from Tern Island tower. You steer 255°T at 8.1 kn through the water. At 1445 a new fix puts you 010°T, 1.9 nm from Heron Point Light.

   Plot the 1445 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  

6. At 1540 your fix is 042°T, 1.2 nm from Westfield church spire. You steer 029°T at 6.3 kn through the water. At 1610 a new fix puts you 042°T, 4.4 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0845 your fix is 039°T, 4.7 nm from Gannet Rock daybeacon. You steer 230°T at 6.9 kn through the water. At 0925 a new fix puts you 152°T, 1.3 nm from Tern Island tower.

   Plot the 0925 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 1200 your fix is 030°T, 1.2 nm from Tern Island tower. You steer 073°T at 7.0 kn through the water. At 1240 a new fix puts you 057°T, 4.3 nm from Tern Island tower.

   Plot the 1240 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