Worksheet 885 · Skill 5

Set and drift

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1. At 1500 your fix is 001°T, 3.6 nm from Westfield church spire. You steer 127°T at 6.2 kn through the water. At 1545 a new fix puts you 284°T, 2.1 nm from Tern Island tower.

   Plot the 1545 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 1450 your fix is 033°T, 2.0 nm from Mill stack. You steer 308°T at 4.0 kn through the water. At 1540 a new fix puts you 227°T, 2.5 nm from Tern Island tower.

   Plot the 1540 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 1220 your fix is 047°T, 2.4 nm from Westfield church spire. You steer 163°T at 4.7 kn through the water. At 1325 a new fix puts you 022°T, 1.8 nm from Heron Point Light.

   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  

4. At 0815 your fix is 074°T, 2.0 nm from Heron Point Light. You steer 321°T at 4.6 kn through the water. At 0850 a new fix puts you 009°T, 2.0 nm from Heron Point Light.

   Plot the 0850 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  

5. At 1150 your fix is 082°T, 2.0 nm from Gannet Rock daybeacon. You steer 247°T at 4.2 kn through the water. At 1255 a new fix puts you 054°T, 1.5 nm from Mill stack.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1140 your fix is 196°T, 1.8 nm from Gannet Rock daybeacon. You steer 037°T at 5.2 kn through the water. At 1215 a new fix puts you 079°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1215 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 1000 your fix is 283°T, 1.7 nm from Tern Island tower. You steer 222°T at 6.1 kn through the water. At 1055 a new fix puts you 325°T, 1.3 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1235 your fix is 271°T, 3.7 nm from Tern Island tower. You steer 143°T at 6.9 kn through the water. At 1310 a new fix puts you 358°T, 3.0 nm from Mill stack.

   Plot the 1310 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