Worksheet 136 · Skill 5

Set and drift

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1. At 1140 your fix is 207°T, 1.9 nm from Tern Island tower. You steer 126°T at 4.0 kn through the water. At 1230 a new fix puts you 352°T, 1.0 nm from Kittle water tank.

   Plot the 1230 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  

2. At 1530 your fix is 065°T, 3.0 nm from Tern Island tower. You steer 174°T at 6.2 kn through the water. At 1610 a new fix puts you 135°T, 3.0 nm from Tern Island tower.

   Plot the 1610 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  

3. At 1455 your fix is 081°T, 3.2 nm from Westfield church spire. You steer 025°T at 4.7 kn through the water. At 1540 a new fix puts you 046°T, 4.4 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1220 your fix is 021°T, 3.3 nm from Westfield church spire. You steer 089°T at 5.8 kn through the water. At 1340 a new fix puts you 040°T, 3.3 nm from Tern Island tower.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1130 your fix is 035°T, 2.4 nm from Mill stack. You steer 331°T at 4.8 kn through the water. At 1215 a new fix puts you 057°T, 3.3 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1235 your fix is 055°T, 3.6 nm from Tern Island tower. You steer 266°T at 7.5 kn through the water. At 1310 a new fix puts you 345°T, 1.7 nm from Tern Island tower.

   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  

7. At 1235 your fix is 280°T, 1.3 nm from Gannet Rock daybeacon. You steer 035°T at 4.1 kn through the water. At 1355 a new fix puts you 035°T, 4.4 nm from Gannet Rock daybeacon.

   Plot the 1355 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  

8. At 1500 your fix is 057°T, 4.3 nm from Tern Island tower. You steer 210°T at 4.3 kn through the water. At 1605 a new fix puts you 236°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1605 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