Worksheet 253 · Skill 5

Set and drift

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1. At 1120 your fix is 054°T, 2.5 nm from Heron Point Light. You steer 078°T at 5.0 kn through the water. At 1205 a new fix puts you 267°T, 2.7 nm from Gannet Rock daybeacon.

   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  

2. At 1220 your fix is 082°T, 2.7 nm from Westfield church spire. You steer 117°T at 4.3 kn through the water. At 1250 a new fix puts you 221°T, 2.8 nm from Tern Island tower.

   Plot the 1250 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 1425 your fix is 097°T, 2.3 nm from Westfield church spire. You steer 099°T at 6.0 kn through the water. At 1510 a new fix puts you 256°T, 1.0 nm from Gannet Rock daybeacon.

   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  

4. At 1425 your fix is 036°T, 1.3 nm from Westfield church spire. You steer 113°T at 7.6 kn through the water. At 1455 a new fix puts you 227°T, 3.4 nm from Tern Island tower.

   Plot the 1455 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 1230 your fix is 065°T, 2.6 nm from Heron Point Light. You steer 026°T at 5.6 kn through the water. At 1310 a new fix puts you 303°T, 2.6 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  

6. At 1335 your fix is 044°T, 4.3 nm from Westfield church spire. You steer 132°T at 5.9 kn through the water. At 1500 a new fix puts you 179°T, 1.9 nm from Tern Island tower.

   Plot the 1500 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0905 your fix is 274°T, 1.9 nm from Tern Island tower. You steer 195°T at 6.3 kn through the water. At 0935 a new fix puts you 046°T, 3.5 nm from Heron Point Light.

   Plot the 0935 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  

8. At 0800 your fix is 331°T, 1.4 nm from Tern Island tower. You steer 259°T at 5.4 kn through the water. At 0900 a new fix puts you 068°T, 2.3 nm from Westfield church spire.

   Plot the 0900 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