Worksheet 513 · Skill 5

Set and drift

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1. At 1420 your fix is 248°T, 2.7 nm from Gannet Rock daybeacon. You steer 054°T at 8.3 kn through the water. At 1505 a new fix puts you 030°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1505 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 1025 your fix is 090°T, 2.2 nm from Heron Point Light. You steer 339°T at 4.1 kn through the water. At 1110 a new fix puts you 052°T, 2.2 nm from Heron Point Light.

   Plot the 1110 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 0950 your fix is 180°T, 1.7 nm from Tern Island tower. You steer 246°T at 5.3 kn through the water. At 1025 a new fix puts you 065°T, 1.9 nm from Heron Point Light.

   Plot the 1025 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 0920 your fix is 334°T, 2.2 nm from Tern Island tower. You steer 211°T at 4.3 kn through the water. At 0955 a new fix puts you 278°T, 3.3 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0800 your fix is 062°T, 3.7 nm from Westfield church spire. You steer 271°T at 4.9 kn through the water. At 0840 a new fix puts you 031°T, 2.2 nm from Westfield church spire.

   Plot the 0840 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  

6. At 1025 your fix is 124°T, 1.8 nm from Gannet Rock daybeacon. You steer 020°T at 4.1 kn through the water. At 1110 a new fix puts you 027°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1110 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  

7. At 0920 your fix is 101°T, 2.1 nm from Gannet Rock daybeacon. You steer 002°T at 4.8 kn through the water. At 0955 a new fix puts you 043°T, 4.6 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0745 your fix is 078°T, 3.4 nm from Westfield church spire. You steer 177°T at 4.7 kn through the water. At 0825 a new fix puts you 084°T, 1.0 nm from Heron Point Light.

   Plot the 0825 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