Worksheet 779 · Skill 5

Set and drift

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1. At 1220 your fix is 076°T, 3.1 nm from Westfield church spire. You steer 063°T at 4.5 kn through the water. At 1305 a new fix puts you 323°T, 2.2 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1230 your fix is 155°T, 2.9 nm from Tern Island tower. You steer 301°T at 4.3 kn through the water. At 1310 a new fix puts you 220°T, 3.1 nm from Tern Island tower.

   Plot the 1310 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  

3. At 1255 your fix is 060°T, 2.5 nm from Heron Point Light. You steer 343°T at 4.6 kn through the water. At 1340 a new fix puts you 289°T, 4.0 nm from Tern Island tower.

   Plot the 1340 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 1340 your fix is 338°T, 1.9 nm from Heron Point Light. You steer 052°T at 6.3 kn through the water. At 1425 a new fix puts you 253°T, 3.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1315 your fix is 244°T, 1.0 nm from Gannet Rock daybeacon. You steer 305°T at 5.7 kn through the water. At 1415 a new fix puts you 257°T, 3.4 nm from Tern Island tower.

   Plot the 1415 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  

6. At 0910 your fix is 103°T, 1.6 nm from Westfield church spire. You steer 135°T at 4.4 kn through the water. At 1015 a new fix puts you 057°T, 2.8 nm from Heron Point Light.

   Plot the 1015 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  

7. At 0700 your fix is 027°T, 1.7 nm from Heron Point Light. You steer 016°T at 4.2 kn through the water. At 0750 a new fix puts you 279°T, 3.3 nm from Tern Island tower.

   Plot the 0750 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 0705 your fix is 068°T, 3.3 nm from Westfield church spire. You steer 152°T at 4.9 kn through the water. At 0800 a new fix puts you 016°T, 2.5 nm from Mill stack.

   Plot the 0800 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