Worksheet 435 · Skill 5

Set and drift

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1. At 1015 your fix is 067°T, 1.5 nm from Westfield church spire. You steer 110°T at 8.1 kn through the water. At 1105 a new fix puts you 244°T, 2.5 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1040 your fix is 135°T, 1.6 nm from Westfield church spire. You steer 044°T at 4.3 kn through the water. At 1110 a new fix puts you 092°T, 1.9 nm from Westfield church spire.

   Plot the 1110 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 1440 your fix is 035°T, 2.0 nm from Westfield church spire. You steer 113°T at 6.5 kn through the water. At 1555 a new fix puts you 230°T, 1.8 nm from Gannet Rock daybeacon.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0940 your fix is 037°T, 4.2 nm from Westfield church spire. You steer 152°T at 8.2 kn through the water. At 1020 a new fix puts you 259°T, 2.7 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1045 your fix is 043°T, 2.9 nm from Gannet Rock daybeacon. You steer 353°T at 4.9 kn through the water. At 1120 a new fix puts you 058°T, 4.8 nm from Tern Island tower.

   Plot the 1120 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 1440 your fix is 211°T, 2.9 nm from Tern Island tower. You steer 259°T at 7.6 kn through the water. At 1515 a new fix puts you 018°T, 2.1 nm from Heron Point Light.

   Plot the 1515 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  

7. At 0915 your fix is 083°T, 2.4 nm from Westfield church spire. You steer 139°T at 7.2 kn through the water. At 1005 a new fix puts you 280°T, 2.4 nm from Kittle water tank.

   Plot the 1005 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  

8. At 1240 your fix is 013°T, 1.0 nm from Kittle water tank. You steer 013°T at 5.2 kn through the water. At 1325 a new fix puts you 061°T, 3.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn