Worksheet 408 · Skill 5

Set and drift

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1. At 0725 your fix is 271°T, 1.3 nm from Gannet Rock daybeacon. You steer 290°T at 5.5 kn through the water. At 0845 a new fix puts you 021°T, 2.0 nm from Westfield church spire.

   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  

2. At 1225 your fix is 131°T, 3.0 nm from Tern Island tower. You steer 038°T at 5.5 kn through the water. At 1310 a new fix puts you 058°T, 4.6 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1245 your fix is 066°T, 3.5 nm from Tern Island tower. You steer 187°T at 4.5 kn through the water. At 1350 a new fix puts you 105°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1350 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 1340 your fix is 348°T, 2.4 nm from Mill stack. You steer 010°T at 4.0 kn through the water. At 1500 a new fix puts you 215°T, 1.9 nm from Tern Island tower.

   Plot the 1500 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 1230 your fix is 051°T, 1.8 nm from Heron Point Light. You steer 100°T at 6.7 kn through the water. At 1335 a new fix puts you 044°T, 2.5 nm from Kittle water tank.

   Plot the 1335 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  

6. At 0905 your fix is 233°T, 1.9 nm from Tern Island tower. You steer 140°T at 5.1 kn through the water. At 0950 a new fix puts you 236°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0950 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 1445 your fix is 054°T, 2.3 nm from Heron Point Light. You steer 332°T at 7.9 kn through the water. At 1515 a new fix puts you 059°T, 2.1 nm from Westfield church spire.

   Plot the 1515 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  

8. At 0935 your fix is 058°T, 3.1 nm from Tern Island tower. You steer 181°T at 4.8 kn through the water. At 1010 a new fix puts you 010°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1010 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