Worksheet 240 · Skill 5

Set and drift

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1. At 0800 your fix is 097°T, 2.4 nm from Westfield church spire. You steer 055°T at 8.4 kn through the water. At 0835 a new fix puts you 003°T, 1.9 nm from Tern Island tower.

   Plot the 0835 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 1555 your fix is 093°T, 1.3 nm from Westfield church spire. You steer 105°T at 4.9 kn through the water. At 1630 a new fix puts you 247°T, 3.3 nm from Tern Island tower.

   Plot the 1630 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 1515 your fix is 096°T, 2.0 nm from Heron Point Light. You steer 008°T at 5.3 kn through the water. At 1620 a new fix puts you 075°T, 2.8 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0725 your fix is 312°T, 3.2 nm from Tern Island tower. You steer 196°T at 4.0 kn through the water. At 0845 a new fix puts you 230°T, 3.0 nm from Tern Island tower.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1310 your fix is 345°T, 1.6 nm from Gannet Rock daybeacon. You steer 185°T at 8.0 kn through the water. At 1340 a new fix puts you 206°T, 2.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1115 your fix is 087°T, 0.9 nm from Gannet Rock daybeacon. You steer 222°T at 5.3 kn through the water. At 1155 a new fix puts you 048°T, 2.3 nm from Mill stack.

   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 0840 your fix is 348°T, 1.6 nm from Heron Point Light. You steer 055°T at 4.8 kn through the water. At 0930 a new fix puts you 218°T, 1.7 nm from Tern Island tower.

   Plot the 0930 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 1435 your fix is 026°T, 2.6 nm from Heron Point Light. You steer 010°T at 5.0 kn through the water. At 1505 a new fix puts you 074°T, 3.5 nm from Westfield church spire.

   Plot the 1505 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