Worksheet 680 · Skill 5

Set and drift

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1. At 1015 your fix is 344°T, 2.4 nm from Tern Island tower. You steer 123°T at 6.0 kn through the water. At 1050 a new fix puts you 018°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1050 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  

2. At 1200 your fix is 075°T, 1.6 nm from Tern Island tower. You steer 081°T at 5.2 kn through the water. At 1235 a new fix puts you 066°T, 4.8 nm from Tern Island tower.

   Plot the 1235 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 1525 your fix is 043°T, 2.3 nm from Westfield church spire. You steer 095°T at 5.5 kn through the water. At 1610 a new fix puts you 243°T, 2.7 nm from Tern Island tower.

   Plot the 1610 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 1200 your fix is 040°T, 1.9 nm from Heron Point Light. You steer 010°T at 5.3 kn through the water. At 1255 a new fix puts you 049°T, 4.2 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0945 your fix is 183°T, 1.1 nm from Gannet Rock daybeacon. You steer 301°T at 5.7 kn through the water. At 1045 a new fix puts you 251°T, 3.5 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0710 your fix is 047°T, 1.7 nm from Westfield church spire. You steer 070°T at 4.1 kn through the water. At 0750 a new fix puts you 066°T, 3.8 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1000 your fix is 218°T, 1.9 nm from Gannet Rock daybeacon. You steer 270°T at 4.1 kn through the water. At 1105 a new fix puts you 334°T, 0.9 nm from Mill stack.

   Plot the 1105 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  

8. At 1430 your fix is 057°T, 4.1 nm from Tern Island tower. You steer 216°T at 5.9 kn through the water. At 1555 a new fix puts you 034°T, 1.3 nm from Mill stack.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn