Worksheet 141 · Skill 5

Set and drift

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1. At 0805 your fix is 096°T, 1.9 nm from Heron Point Light. You steer 345°T at 8.9 kn through the water. At 0840 a new fix puts you 061°T, 3.6 nm from Westfield church spire.

   Plot the 0840 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 0735 your fix is 109°T, 2.1 nm from Westfield church spire. You steer 081°T at 5.4 kn through the water. At 0805 a new fix puts you 051°T, 3.2 nm from Heron Point Light.

   Plot the 0805 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 1105 your fix is 191°T, 1.8 nm from Gannet Rock daybeacon. You steer 052°T at 5.4 kn through the water. At 1140 a new fix puts you 066°T, 2.6 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1105 your fix is 231°T, 3.1 nm from Tern Island tower. You steer 109°T at 7.2 kn through the water. At 1145 a new fix puts you 221°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1145 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 1325 your fix is 359°T, 0.8 nm from Kittle water tank. You steer 271°T at 7.8 kn through the water. At 1400 a new fix puts you 350°T, 1.8 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0705 your fix is 300°T, 3.0 nm from Tern Island tower. You steer 216°T at 5.4 kn through the water. At 0805 a new fix puts you 109°T, 1.1 nm from Westfield church spire.

   Plot the 0805 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  

7. At 0910 your fix is 001°T, 2.6 nm from Mill stack. You steer 059°T at 4.3 kn through the water. At 1000 a new fix puts you 359°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1000 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 1135 your fix is 011°T, 1.7 nm from Heron Point Light. You steer 111°T at 5.2 kn through the water. At 1240 a new fix puts you 276°T, 2.5 nm from Kittle water tank.

   Plot the 1240 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