Worksheet 219 · Skill 5

Set and drift

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1. At 1505 your fix is 168°T, 0.8 nm from Gannet Rock daybeacon. You steer 267°T at 8.4 kn through the water. At 1550 a new fix puts you 051°T, 2.1 nm from Heron Point Light.

   Plot the 1550 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 1535 your fix is 209°T, 2.5 nm from Tern Island tower. You steer 181°T at 4.3 kn through the water. At 1615 a new fix puts you 011°T, 1.5 nm from Mill stack.

   Plot the 1615 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  

3. At 1035 your fix is 218°T, 2.5 nm from Gannet Rock daybeacon. You steer 071°T at 8.3 kn through the water. At 1105 a new fix puts you 113°T, 2.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1345 your fix is 230°T, 1.7 nm from Gannet Rock daybeacon. You steer 322°T at 7.3 kn through the water. At 1445 a new fix puts you 296°T, 4.0 nm from Tern Island tower.

   Plot the 1445 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  

5. At 1425 your fix is 148°T, 1.1 nm from Westfield church spire. You steer 127°T at 5.4 kn through the water. At 1525 a new fix puts you 304°T, 1.8 nm from Mill stack.

   Plot the 1525 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 1200 your fix is 050°T, 2.3 nm from Gannet Rock daybeacon. You steer 327°T at 5.0 kn through the water. At 1250 a new fix puts you 058°T, 3.4 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1110 your fix is 028°T, 3.3 nm from Heron Point Light. You steer 004°T at 6.4 kn through the water. At 1140 a new fix puts you 291°T, 3.4 nm from Tern Island tower.

   Plot the 1140 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 0935 your fix is 073°T, 2.3 nm from Westfield church spire. You steer 157°T at 4.3 kn through the water. At 1015 a new fix puts you 032°T, 1.8 nm from Heron Point Light.

   Plot the 1015 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