Worksheet 812 · Skill 5

Set and drift

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1. At 1130 your fix is 359°T, 2.6 nm from Mill stack. You steer 045°T at 4.3 kn through the water. At 1200 a new fix puts you 205°T, 2.7 nm from Tern Island tower.

   Plot the 1200 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 1550 your fix is 259°T, 3.4 nm from Tern Island tower. You steer 153°T at 4.5 kn through the water. At 1655 a new fix puts you 196°T, 2.4 nm from Tern Island tower.

   Plot the 1655 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  

3. At 1510 your fix is 101°T, 1.1 nm from Westfield church spire. You steer 100°T at 7.9 kn through the water. At 1555 a new fix puts you 191°T, 2.0 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1215 your fix is 007°T, 1.7 nm from Kittle water tank. You steer 340°T at 5.8 kn through the water. At 1250 a new fix puts you 009°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1250 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 0920 your fix is 042°T, 4.5 nm from Westfield church spire. You steer 190°T at 5.8 kn through the water. At 1005 a new fix puts you 042°T, 1.7 nm from Heron Point Light.

   Plot the 1005 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 1110 your fix is 286°T, 1.4 nm from Tern Island tower. You steer 203°T at 5.9 kn through the water. At 1155 a new fix puts you 078°T, 1.7 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1015 your fix is 349°T, 1.0 nm from Heron Point Light. You steer 356°T at 6.3 kn through the water. At 1050 a new fix puts you 062°T, 1.9 nm from Westfield church spire.

   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 1045 your fix is 039°T, 3.0 nm from Westfield church spire. You steer 148°T at 5.0 kn through the water. At 1120 a new fix puts you 068°T, 3.2 nm from Westfield church spire.

   Plot the 1120 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