Worksheet 569 · Skill 5

Set and drift

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1. At 1215 your fix is 049°T, 1.9 nm from Heron Point Light. You steer 036°T at 4.3 kn through the water. At 1300 a new fix puts you 038°T, 3.4 nm from Heron Point Light.

   Plot the 1300 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  

2. At 1035 your fix is 006°T, 1.5 nm from Heron Point Light. You steer 121°T at 4.0 kn through the water. At 1110 a new fix puts you 108°T, 2.0 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1405 your fix is 026°T, 2.5 nm from Westfield church spire. You steer 130°T at 8.3 kn through the water. At 1450 a new fix puts you 000°T, 3.0 nm from Mill stack.

   Plot the 1450 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  

4. At 1535 your fix is 060°T, 2.0 nm from Heron Point Light. You steer 304°T at 4.2 kn through the water. At 1620 a new fix puts you 006°T, 2.4 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1150 your fix is 330°T, 1.7 nm from Heron Point Light. You steer 005°T at 6.3 kn through the water. At 1235 a new fix puts you 056°T, 3.5 nm from Westfield church spire.

   Plot the 1235 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 1025 your fix is 028°T, 1.8 nm from Heron Point Light. You steer 129°T at 7.4 kn through the water. At 1055 a new fix puts you 009°T, 1.8 nm from Mill stack.

   Plot the 1055 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 1335 your fix is 096°T, 2.3 nm from Gannet Rock daybeacon. You steer 351°T at 4.8 kn through the water. At 1420 a new fix puts you 037°T, 2.4 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0805 your fix is 205°T, 2.7 nm from Tern Island tower. You steer 294°T at 7.6 kn through the water. At 0845 a new fix puts you 089°T, 2.5 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn