Worksheet 208 · Skill 5

Set and drift

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1. At 0735 your fix is 070°T, 2.5 nm from Heron Point Light. You steer 322°T at 5.0 kn through the water. At 0855 a new fix puts you 063°T, 2.3 nm from Westfield church spire.

   Plot the 0855 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0935 your fix is 049°T, 2.3 nm from Mill stack. You steer 073°T at 5.7 kn through the water. At 1010 a new fix puts you 025°T, 1.6 nm from Kittle water tank.

   Plot the 1010 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 0730 your fix is 230°T, 3.5 nm from Tern Island tower. You steer 081°T at 8.2 kn through the water. At 0805 a new fix puts you 344°T, 1.2 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0900 your fix is 026°T, 2.4 nm from Gannet Rock daybeacon. You steer 164°T at 4.9 kn through the water. At 0950 a new fix puts you 330°T, 1.0 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1445 your fix is 011°T, 2.3 nm from Westfield church spire. You steer 162°T at 6.1 kn through the water. At 1520 a new fix puts you 135°T, 1.5 nm from Westfield church spire.

   Plot the 1520 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 0930 your fix is 298°T, 4.4 nm from Tern Island tower. You steer 140°T at 8.3 kn through the water. At 1035 a new fix puts you 333°T, 1.0 nm from Kittle water tank.

   Plot the 1035 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  

7. At 1525 your fix is 052°T, 1.4 nm from Heron Point Light. You steer 105°T at 4.7 kn through the water. At 1620 a new fix puts you 044°T, 1.7 nm from Mill stack.

   Plot the 1620 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  

8. At 0940 your fix is 035°T, 1.6 nm from Kittle water tank. You steer 272°T at 4.4 kn through the water. At 1035 a new fix puts you 207°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1035 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