Worksheet 205 · Skill 5

Set and drift

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1. At 0910 your fix is 079°T, 1.6 nm from Heron Point Light. You steer 355°T at 5.5 kn through the water. At 1020 a new fix puts you 065°T, 3.4 nm from Westfield church spire.

   Plot the 1020 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  

2. At 1120 your fix is 266°T, 1.2 nm from Gannet Rock daybeacon. You steer 243°T at 4.7 kn through the water. At 1205 a new fix puts you 057°T, 3.0 nm from Heron Point Light.

   Plot the 1205 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 1340 your fix is 255°T, 1.8 nm from Gannet Rock daybeacon. You steer 135°T at 4.2 kn through the water. At 1415 a new fix puts you 169°T, 1.1 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0715 your fix is 287°T, 4.0 nm from Tern Island tower. You steer 229°T at 4.3 kn through the water. At 0755 a new fix puts you 101°T, 2.6 nm from Westfield church spire.

   Plot the 0755 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  

5. At 1220 your fix is 209°T, 1.5 nm from Tern Island tower. You steer 281°T at 5.8 kn through the water. At 1305 a new fix puts you 038°T, 2.6 nm from Westfield church spire.

   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  

6. At 0715 your fix is 027°T, 1.5 nm from Gannet Rock daybeacon. You steer 034°T at 8.2 kn through the water. At 0745 a new fix puts you 037°T, 4.5 nm from Gannet Rock daybeacon.

   Plot the 0745 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  

7. At 1450 your fix is 074°T, 3.0 nm from Westfield church spire. You steer 182°T at 5.1 kn through the water. At 1530 a new fix puts you 030°T, 0.9 nm from Heron Point Light.

   Plot the 1530 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  

8. At 1250 your fix is 038°T, 2.4 nm from Tern Island tower. You steer 275°T at 9.0 kn through the water. At 1340 a new fix puts you 010°T, 3.7 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn