Worksheet 554 · Skill 5

Set and drift

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1. At 1335 your fix is 001°T, 2.4 nm from Mill stack. You steer 339°T at 7.0 kn through the water. At 1415 a new fix puts you 049°T, 3.0 nm from Westfield church spire.

   Plot the 1415 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  

2. At 1230 your fix is 157°T, 1.7 nm from Westfield church spire. You steer 090°T at 4.3 kn through the water. At 1340 a new fix puts you 055°T, 3.5 nm from Heron Point Light.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1320 your fix is 031°T, 3.6 nm from Westfield church spire. You steer 115°T at 5.2 kn through the water. At 1410 a new fix puts you 243°T, 1.7 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1310 your fix is 240°T, 1.3 nm from Tern Island tower. You steer 133°T at 8.4 kn through the water. At 1340 a new fix puts you 335°T, 1.5 nm from Kittle water tank.

   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  

5. At 0840 your fix is 044°T, 2.7 nm from Heron Point Light. You steer 023°T at 4.0 kn through the water. At 0910 a new fix puts you 232°T, 2.5 nm from Tern Island tower.

   Plot the 0910 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 0805 your fix is 148°T, 2.6 nm from Tern Island tower. You steer 039°T at 6.5 kn through the water. At 0840 a new fix puts you 062°T, 3.4 nm from Tern Island tower.

   Plot the 0840 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 1145 your fix is 192°T, 1.7 nm from Gannet Rock daybeacon. You steer 284°T at 5.6 kn through the water. At 1220 a new fix puts you 250°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1220 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 0710 your fix is 266°T, 2.3 nm from Gannet Rock daybeacon. You steer 044°T at 5.8 kn through the water. At 0755 a new fix puts you 090°T, 1.7 nm from Tern Island tower.

   Plot the 0755 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