Worksheet 4 · Skill 5

Set and drift

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1. At 1535 your fix is 060°T, 3.1 nm from Gannet Rock daybeacon. You steer 318°T at 7.8 kn through the water. At 1610 a new fix puts you 061°T, 2.2 nm from Tern Island tower.

   Plot the 1610 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 1455 your fix is 311°T, 3.2 nm from Tern Island tower. You steer 221°T at 6.7 kn through the water. At 1535 a new fix puts you 152°T, 1.3 nm from Westfield church spire.

   Plot the 1535 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  

3. At 0820 your fix is 327°T, 1.1 nm from Kittle water tank. You steer 291°T at 6.5 kn through the water. At 0940 a new fix puts you 060°T, 3.4 nm from Heron Point Light.

   Plot the 0940 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  

4. At 1255 your fix is 024°T, 2.7 nm from Heron Point Light. You steer 164°T at 4.3 kn through the water. At 1335 a new fix puts you 330°T, 1.8 nm from Mill stack.

   Plot the 1335 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 1450 your fix is 071°T, 5.0 nm from Tern Island tower. You steer 194°T at 5.4 kn through the water. At 1555 a new fix puts you 311°T, 1.7 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1435 your fix is 039°T, 4.4 nm from Gannet Rock daybeacon. You steer 200°T at 4.4 kn through the water. At 1510 a new fix puts you 079°T, 2.1 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1055 your fix is 007°T, 3.2 nm from Mill stack. You steer 284°T at 4.5 kn through the water. At 1145 a new fix puts you 118°T, 1.7 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1225 your fix is 191°T, 1.1 nm from Gannet Rock daybeacon. You steer 286°T at 5.8 kn through the water. At 1350 a new fix puts you 105°T, 2.6 nm from Westfield church spire.

   Plot the 1350 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn