Worksheet 190 · Skill 5

Set and drift

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1. At 1325 your fix is 039°T, 2.8 nm from Gannet Rock daybeacon. You steer 247°T at 7.2 kn through the water. At 1415 a new fix puts you 244°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1415 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 0805 your fix is 065°T, 4.0 nm from Tern Island tower. You steer 213°T at 8.8 kn through the water. At 0855 a new fix puts you 255°T, 1.9 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0710 your fix is 270°T, 2.2 nm from Gannet Rock daybeacon. You steer 290°T at 7.2 kn through the water. At 0740 a new fix puts you 085°T, 3.3 nm from Westfield church spire.

   Plot the 0740 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 0815 your fix is 058°T, 2.6 nm from Tern Island tower. You steer 162°T at 5.6 kn through the water. At 0910 a new fix puts you 006°T, 1.0 nm from Kittle water tank.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1255 your fix is 274°T, 1.6 nm from Gannet Rock daybeacon. You steer 233°T at 4.0 kn through the water. At 1330 a new fix puts you 020°T, 2.6 nm from Mill stack.

   Plot the 1330 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 1115 your fix is 075°T, 1.9 nm from Tern Island tower. You steer 292°T at 8.1 kn through the water. At 1155 a new fix puts you 306°T, 4.4 nm from Tern Island tower.

   Plot the 1155 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  

7. At 0820 your fix is 350°T, 1.1 nm from Gannet Rock daybeacon. You steer 239°T at 6.7 kn through the water. At 0900 a new fix puts you 065°T, 2.9 nm from Heron Point Light.

   Plot the 0900 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  

8. At 1325 your fix is 074°T, 3.8 nm from Tern Island tower. You steer 218°T at 5.0 kn through the water. At 1455 a new fix puts you 003°T, 2.3 nm from Mill stack.

   Plot the 1455 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn