Worksheet 162 · Skill 5

Set and drift

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1. At 1115 your fix is 308°T, 1.6 nm from Kittle water tank. You steer 018°T at 5.4 kn through the water. At 1205 a new fix puts you 052°T, 3.9 nm from Gannet Rock daybeacon.

   Plot the 1205 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 1450 your fix is 078°T, 2.8 nm from Westfield church spire. You steer 102°T at 5.5 kn through the water. At 1610 a new fix puts you 051°T, 1.9 nm from Kittle water tank.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0910 your fix is 272°T, 3.3 nm from Tern Island tower. You steer 212°T at 7.0 kn through the water. At 0940 a new fix puts you 131°T, 1.8 nm from Westfield church spire.

   Plot the 0940 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 1215 your fix is 053°T, 1.1 nm from Heron Point Light. You steer 337°T at 8.2 kn through the water. At 1250 a new fix puts you 018°T, 2.0 nm from Westfield church spire.

   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 1000 your fix is 051°T, 2.8 nm from Heron Point Light. You steer 016°T at 5.9 kn through the water. At 1040 a new fix puts you 322°T, 1.4 nm from Tern Island tower.

   Plot the 1040 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  

6. At 1330 your fix is 030°T, 2.1 nm from Mill stack. You steer 339°T at 5.9 kn through the water. At 1410 a new fix puts you 294°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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1340 your fix is 061°T, 2.3 nm from Heron Point Light. You steer 022°T at 5.1 kn through the water. At 1420 a new fix puts you 297°T, 1.3 nm from Tern Island tower.

   Plot the 1420 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  

8. At 1305 your fix is 063°T, 3.1 nm from Tern Island tower. You steer 268°T at 4.6 kn through the water. At 1420 a new fix puts you 299°T, 2.0 nm from Tern Island tower.

   Plot the 1420 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn