Worksheet 499 · Skill 5

Set and drift

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1. At 1500 your fix is 349°T, 1.5 nm from Heron Point Light. You steer 086°T at 4.0 kn through the water. At 1555 a new fix puts you 042°T, 3.3 nm from Heron Point Light.

   Plot the 1555 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  

2. At 1210 your fix is 051°T, 3.2 nm from Westfield church spire. You steer 169°T at 8.7 kn through the water. At 1240 a new fix puts you 048°T, 1.5 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0935 your fix is 108°T, 1.6 nm from Westfield church spire. You steer 097°T at 4.1 kn through the water. At 1045 a new fix puts you 005°T, 1.4 nm from Mill stack.

   Plot the 1045 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1340 your fix is 103°T, 2.9 nm from Westfield church spire. You steer 079°T at 6.5 kn through the water. At 1410 a new fix puts you 253°T, 1.5 nm from Tern Island tower.

   Plot the 1410 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 1050 your fix is 354°T, 2.1 nm from Mill stack. You steer 319°T at 4.0 kn through the water. At 1145 a new fix puts you 061°T, 3.2 nm from Westfield church spire.

   Plot the 1145 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  

6. At 1110 your fix is 264°T, 3.0 nm from Tern Island tower. You steer 120°T at 7.1 kn through the water. At 1220 a new fix puts you 148°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1220 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1320 your fix is 029°T, 3.4 nm from Gannet Rock daybeacon. You steer 229°T at 4.9 kn through the water. At 1435 a new fix puts you 216°T, 3.0 nm from Tern Island tower.

   Plot the 1435 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 1400 your fix is 037°T, 4.3 nm from Gannet Rock daybeacon. You steer 278°T at 5.1 kn through the water. At 1510 a new fix puts you 305°T, 3.3 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn