Worksheet 656 · Skill 5

Set and drift

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1. At 1555 your fix is 280°T, 1.6 nm from Tern Island tower. You steer 212°T at 4.3 kn through the water. At 1625 a new fix puts you 041°T, 3.5 nm from Heron Point Light.

   Plot the 1625 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  

2. At 1435 your fix is 036°T, 3.0 nm from Tern Island tower. You steer 237°T at 8.8 kn through the water. At 1520 a new fix puts you 255°T, 3.4 nm from Tern Island tower.

   Plot the 1520 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  

3. At 1415 your fix is 088°T, 3.1 nm from Westfield church spire. You steer 211°T at 4.8 kn through the water. At 1445 a new fix puts you 004°T, 1.8 nm from Heron Point Light.

   Plot the 1445 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 0740 your fix is 295°T, 4.4 nm from Tern Island tower. You steer 079°T at 5.1 kn through the water. At 0825 a new fix puts you 311°T, 2.5 nm from Tern Island tower.

   Plot the 0825 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 1100 your fix is 041°T, 2.2 nm from Kittle water tank. You steer 338°T at 6.8 kn through the water. At 1135 a new fix puts you 040°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1135 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  

6. At 0740 your fix is 074°T, 2.1 nm from Westfield church spire. You steer 122°T at 4.4 kn through the water. At 0810 a new fix puts you 098°T, 3.0 nm from Westfield church spire.

   Plot the 0810 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 1015 your fix is 112°T, 2.0 nm from Gannet Rock daybeacon. You steer 010°T at 6.8 kn through the water. At 1050 a new fix puts you 038°T, 4.5 nm from Gannet Rock daybeacon.

   Plot the 1050 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  

8. At 1335 your fix is 021°T, 1.4 nm from Westfield church spire. You steer 089°T at 8.7 kn through the water. At 1410 a new fix puts you 227°T, 1.5 nm from Tern Island tower.

   Plot the 1410 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