Worksheet 935 · Skill 5

Set and drift

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1. At 1600 your fix is 208°T, 2.4 nm from Tern Island tower. You steer 238°T at 7.1 kn through the water. At 1630 a new fix puts you 058°T, 1.0 nm from Heron Point Light.

   Plot the 1630 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  

2. At 1330 your fix is 262°T, 1.9 nm from Tern Island tower. You steer 147°T at 4.2 kn through the water. At 1420 a new fix puts you 256°T, 2.5 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0920 your fix is 290°T, 3.3 nm from Tern Island tower. You steer 176°T at 7.1 kn through the water. At 1000 a new fix puts you 063°T, 2.6 nm from Heron Point Light.

   Plot the 1000 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 1515 your fix is 227°T, 1.9 nm from Gannet Rock daybeacon. You steer 033°T at 4.4 kn through the water. At 1635 a new fix puts you 022°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1635 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 0700 your fix is 073°T, 1.9 nm from Gannet Rock daybeacon. You steer 276°T at 6.7 kn through the water. At 0745 a new fix puts you 186°T, 1.9 nm from Tern Island tower.

   Plot the 0745 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 1540 your fix is 260°T, 1.8 nm from Tern Island tower. You steer 144°T at 5.7 kn through the water. At 1635 a new fix puts you 230°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1635 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1450 your fix is 244°T, 1.4 nm from Tern Island tower. You steer 251°T at 4.2 kn through the water. At 1555 a new fix puts you 049°T, 3.3 nm from Heron Point Light.

   Plot the 1555 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  

8. At 1050 your fix is 054°T, 2.2 nm from Tern Island tower. You steer 278°T at 6.6 kn through the water. At 1205 a new fix puts you 052°T, 2.8 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn