Worksheet 529 · Skill 5

Set and drift

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1. At 0740 your fix is 080°T, 3.1 nm from Westfield church spire. You steer 048°T at 5.6 kn through the water. At 0815 a new fix puts you 300°T, 1.8 nm from Tern Island tower.

   Plot the 0815 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 1420 your fix is 237°T, 1.8 nm from Gannet Rock daybeacon. You steer 319°T at 7.3 kn through the water. At 1510 a new fix puts you 276°T, 2.9 nm from Tern Island tower.

   Plot the 1510 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 1425 your fix is 075°T, 2.4 nm from Heron Point Light. You steer 331°T at 7.0 kn through the water. At 1455 a new fix puts you 071°T, 2.2 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1220 your fix is 334°T, 2.1 nm from Mill stack. You steer 334°T at 4.9 kn through the water. At 1325 a new fix puts you 082°T, 2.8 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1505 your fix is 069°T, 2.1 nm from Tern Island tower. You steer 140°T at 5.4 kn through the water. At 1555 a new fix puts you 035°T, 2.7 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1400 your fix is 085°T, 2.3 nm from Gannet Rock daybeacon. You steer 287°T at 4.1 kn through the water. At 1430 a new fix puts you 348°T, 3.2 nm from Kittle water tank.

   Plot the 1430 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 0750 your fix is 073°T, 3.6 nm from Tern Island tower. You steer 217°T at 7.8 kn through the water. At 0845 a new fix puts you 255°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 0845 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 1235 your fix is 058°T, 3.1 nm from Westfield church spire. You steer 118°T at 5.2 kn through the water. At 1340 a new fix puts you 230°T, 2.1 nm from Tern Island tower.

   Plot the 1340 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