Worksheet 475 · Skill 5

Set and drift

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1. At 1005 your fix is 337°T, 1.5 nm from Heron Point Light. You steer 024°T at 5.7 kn through the water. At 1110 a new fix puts you 039°T, 4.0 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1225 your fix is 074°T, 2.8 nm from Gannet Rock daybeacon. You steer 182°T at 5.7 kn through the water. At 1255 a new fix puts you 029°T, 1.8 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1535 your fix is 352°T, 2.0 nm from Tern Island tower. You steer 232°T at 5.6 kn through the water. At 1615 a new fix puts you 034°T, 3.6 nm from Heron Point Light.

   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  

4. At 1155 your fix is 041°T, 3.9 nm from Westfield church spire. You steer 160°T at 6.6 kn through the water. At 1245 a new fix puts you 020°T, 2.3 nm from Heron Point Light.

   Plot the 1245 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 1210 your fix is 075°T, 3.3 nm from Tern Island tower. You steer 294°T at 5.5 kn through the water. At 1255 a new fix puts you 320°T, 2.8 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1350 your fix is 243°T, 1.8 nm from Gannet Rock daybeacon. You steer 243°T at 6.6 kn through the water. At 1420 a new fix puts you 069°T, 2.3 nm from Heron Point Light.

   Plot the 1420 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  

7. At 1540 your fix is 266°T, 2.2 nm from Gannet Rock daybeacon. You steer 110°T at 4.5 kn through the water. At 1630 a new fix puts you 135°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1630 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 0820 your fix is 051°T, 4.1 nm from Westfield church spire. You steer 166°T at 5.6 kn through the water. At 0910 a new fix puts you 014°T, 2.7 nm from Mill stack.

   Plot the 0910 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