Worksheet 113 · Skill 5

Set and drift

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1. At 1230 your fix is 296°T, 1.9 nm from Tern Island tower. You steer 268°T at 4.7 kn through the water. At 1305 a new fix puts you 053°T, 3.7 nm from Westfield church spire.

   Plot the 1305 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 1005 your fix is 030°T, 2.3 nm from Mill stack. You steer 350°T at 4.4 kn through the water. At 1035 a new fix puts you 218°T, 2.9 nm from Tern Island tower.

   Plot the 1035 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  

3. At 1250 your fix is 047°T, 1.6 nm from Kittle water tank. You steer 293°T at 6.7 kn through the water. At 1325 a new fix puts you 217°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1325 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 1520 your fix is 074°T, 2.6 nm from Westfield church spire. You steer 060°T at 5.2 kn through the water. At 1555 a new fix puts you 327°T, 2.6 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1145 your fix is 050°T, 1.6 nm from Heron Point Light. You steer 091°T at 5.7 kn through the water. At 1255 a new fix puts you 286°T, 2.4 nm from Kittle water tank.

   Plot the 1255 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1305 your fix is 286°T, 2.6 nm from Tern Island tower. You steer 136°T at 4.8 kn through the water. At 1350 a new fix puts you 203°T, 1.6 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0715 your fix is 045°T, 2.0 nm from Westfield church spire. You steer 132°T at 4.8 kn through the water. At 0800 a new fix puts you 060°T, 3.4 nm from Heron Point Light.

   Plot the 0800 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  

8. At 1110 your fix is 068°T, 3.6 nm from Westfield church spire. You steer 071°T at 4.8 kn through the water. At 1225 a new fix puts you 054°T, 3.1 nm from Tern Island tower.

   Plot the 1225 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