Worksheet 573 · Skill 5

Set and drift

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1. At 1550 your fix is 064°T, 1.0 nm from Westfield church spire. You steer 127°T at 4.0 kn through the water. At 1655 a new fix puts you 262°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1655 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  

2. At 1015 your fix is 171°T, 1.0 nm from Gannet Rock daybeacon. You steer 307°T at 6.2 kn through the water. At 1130 a new fix puts you 068°T, 3.1 nm from Westfield church spire.

   Plot the 1130 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  

3. At 1045 your fix is 068°T, 0.9 nm from Heron Point Light. You steer 057°T at 4.2 kn through the water. At 1140 a new fix puts you 244°T, 2.6 nm from Tern Island tower.

   Plot the 1140 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  

4. At 1355 your fix is 032°T, 2.7 nm from Tern Island tower. You steer 159°T at 4.3 kn through the water. At 1425 a new fix puts you 069°T, 2.3 nm from Tern Island tower.

   Plot the 1425 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 1205 your fix is 014°T, 2.2 nm from Heron Point Light. You steer 095°T at 4.9 kn through the water. At 1235 a new fix puts you 222°T, 3.0 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1400 your fix is 295°T, 4.3 nm from Tern Island tower. You steer 201°T at 7.1 kn through the water. At 1440 a new fix puts you 337°T, 1.6 nm from Heron Point Light.

   Plot the 1440 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  

7. At 1425 your fix is 340°T, 2.6 nm from Mill stack. You steer 009°T at 4.7 kn through the water. At 1510 a new fix puts you 236°T, 1.8 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1030 your fix is 289°T, 4.0 nm from Tern Island tower. You steer 236°T at 4.4 kn through the water. At 1105 a new fix puts you 086°T, 2.2 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn