Worksheet 584 · Skill 5

Set and drift

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1. At 1330 your fix is 319°T, 2.2 nm from Mill stack. You steer 004°T at 4.8 kn through the water. At 1405 a new fix puts you 255°T, 2.9 nm from Tern Island tower.

   Plot the 1405 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  

2. At 1335 your fix is 072°T, 2.6 nm from Westfield church spire. You steer 101°T at 8.8 kn through the water. At 1420 a new fix puts you 315°T, 1.0 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1340 your fix is 051°T, 3.6 nm from Tern Island tower. You steer 190°T at 6.2 kn through the water. At 1420 a new fix puts you 015°T, 1.3 nm from Gannet Rock daybeacon.

   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  

4. At 0920 your fix is 059°T, 4.4 nm from Tern Island tower. You steer 160°T at 7.7 kn through the water. At 0950 a new fix puts you 052°T, 3.1 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1325 your fix is 071°T, 4.6 nm from Tern Island tower. You steer 246°T at 4.8 kn through the water. At 1355 a new fix puts you 076°T, 2.8 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1330 your fix is 090°T, 1.5 nm from Heron Point Light. You steer 063°T at 7.3 kn through the water. At 1420 a new fix puts you 331°T, 2.9 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1430 your fix is 137°T, 1.6 nm from Westfield church spire. You steer 081°T at 4.9 kn through the water. At 1505 a new fix puts you 256°T, 3.7 nm from Tern Island tower.

   Plot the 1505 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 1435 your fix is 095°T, 1.2 nm from Westfield church spire. You steer 022°T at 5.0 kn through the water. At 1510 a new fix puts you 292°T, 4.0 nm from Tern Island tower.

   Plot the 1510 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