Worksheet 772 · Skill 5

Set and drift

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1. At 0750 your fix is 265°T, 1.8 nm from Tern Island tower. You steer 035°T at 5.5 kn through the water. At 0825 a new fix puts you 352°T, 2.1 nm from Tern Island tower.

   Plot the 0825 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 1325 your fix is 268°T, 2.0 nm from Gannet Rock daybeacon. You steer 059°T at 8.2 kn through the water. At 1410 a new fix puts you 066°T, 4.4 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1050 your fix is 103°T, 1.7 nm from Gannet Rock daybeacon. You steer 147°T at 4.2 kn through the water. At 1125 a new fix puts you 051°T, 1.4 nm from Kittle water tank.

   Plot the 1125 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  

4. At 0905 your fix is 067°T, 1.7 nm from Westfield church spire. You steer 156°T at 4.1 kn through the water. At 0940 a new fix puts you 333°T, 1.0 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1100 your fix is 060°T, 3.2 nm from Heron Point Light. You steer 326°T at 6.5 kn through the water. At 1150 a new fix puts you 042°T, 3.2 nm from Westfield church spire.

   Plot the 1150 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  

6. At 0850 your fix is 083°T, 2.0 nm from Heron Point Light. You steer 075°T at 7.0 kn through the water. At 0920 a new fix puts you 225°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0920 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  

7. At 1435 your fix is 157°T, 1.8 nm from Westfield church spire. You steer 026°T at 7.1 kn through the water. At 1515 a new fix puts you 039°T, 3.5 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1305 your fix is 053°T, 2.7 nm from Gannet Rock daybeacon. You steer 246°T at 4.4 kn through the water. At 1340 a new fix puts you 332°T, 1.0 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn