Worksheet 217 · Skill 5

Set and drift

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1. At 1305 your fix is 064°T, 3.3 nm from Westfield church spire. You steer 167°T at 4.6 kn through the water. At 1400 a new fix puts you 011°T, 2.1 nm from Mill stack.

   Plot the 1400 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 1215 your fix is 297°T, 3.8 nm from Tern Island tower. You steer 177°T at 6.9 kn through the water. At 1250 a new fix puts you 051°T, 3.3 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0910 your fix is 041°T, 2.4 nm from Westfield church spire. You steer 085°T at 4.7 kn through the water. At 0950 a new fix puts you 291°T, 3.8 nm from Tern Island tower.

   Plot the 0950 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  

4. At 0825 your fix is 084°T, 2.7 nm from Gannet Rock daybeacon. You steer 227°T at 4.4 kn through the water. At 0910 a new fix puts you 138°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0910 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 137°T, 2.7 nm from Tern Island tower. You steer 034°T at 5.5 kn through the water. At 1350 a new fix puts you 085°T, 2.6 nm from Tern Island tower.

   Plot the 1350 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  

6. At 1205 your fix is 038°T, 4.2 nm from Westfield church spire. You steer 091°T at 8.7 kn through the water. At 1255 a new fix puts you 062°T, 4.6 nm from Tern Island tower.

   Plot the 1255 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  

7. At 1245 your fix is 178°T, 1.6 nm from Tern Island tower. You steer 081°T at 4.8 kn through the water. At 1325 a new fix puts you 037°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1325 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 0910 your fix is 256°T, 1.1 nm from Gannet Rock daybeacon. You steer 319°T at 4.3 kn through the water. At 1025 a new fix puts you 237°T, 3.1 nm from Tern Island tower.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn