Worksheet 847 · Skill 5

Set and drift

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1. At 1205 your fix is 025°T, 2.8 nm from Westfield church spire. You steer 140°T at 8.0 kn through the water. At 1305 a new fix puts you 003°T, 3.2 nm from Mill stack.

   Plot the 1305 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 1425 your fix is 125°T, 1.2 nm from Westfield church spire. You steer 039°T at 4.5 kn through the water. At 1510 a new fix puts you 301°T, 4.1 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  

3. At 0910 your fix is 249°T, 1.3 nm from Gannet Rock daybeacon. You steer 313°T at 6.9 kn through the water. At 0955 a new fix puts you 287°T, 3.6 nm from Tern Island tower.

   Plot the 0955 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  

4. At 0825 your fix is 341°T, 2.0 nm from Mill stack. You steer 082°T at 8.9 kn through the water. At 0910 a new fix puts you 091°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0910 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 1600 your fix is 048°T, 1.1 nm from Westfield church spire. You steer 149°T at 6.7 kn through the water. At 1635 a new fix puts you 090°T, 1.1 nm from Heron Point Light.

   Plot the 1635 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 0825 your fix is 021°T, 2.4 nm from Gannet Rock daybeacon. You steer 151°T at 5.0 kn through the water. At 0920 a new fix puts you 096°T, 2.9 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1205 your fix is 193°T, 1.9 nm from Gannet Rock daybeacon. You steer 279°T at 5.4 kn through the water. At 1320 a new fix puts you 048°T, 2.3 nm from Heron Point Light.

   Plot the 1320 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 1435 your fix is 338°T, 1.5 nm from Gannet Rock daybeacon. You steer 226°T at 6.0 kn through the water. At 1515 a new fix puts you 354°T, 1.9 nm from Mill stack.

   Plot the 1515 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