Worksheet 474 · Skill 5

Set and drift

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1. At 1130 your fix is 357°T, 1.6 nm from Kittle water tank. You steer 271°T at 9.0 kn through the water. At 1225 a new fix puts you 043°T, 1.3 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1000 your fix is 286°T, 2.7 nm from Tern Island tower. You steer 236°T at 5.6 kn through the water. At 1045 a new fix puts you 146°T, 1.5 nm from Westfield church spire.

   Plot the 1045 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 1215 your fix is 352°T, 1.9 nm from Mill stack. You steer 296°T at 4.1 kn through the water. At 1255 a new fix puts you 049°T, 2.3 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1335 your fix is 253°T, 2.6 nm from Tern Island tower. You steer 325°T at 4.0 kn through the water. At 1425 a new fix puts you 297°T, 3.9 nm from Tern Island tower.

   Plot the 1425 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  

5. At 1315 your fix is 011°T, 2.3 nm from Westfield church spire. You steer 165°T at 6.4 kn through the water. At 1355 a new fix puts you 141°T, 3.8 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1150 your fix is 027°T, 1.7 nm from Kittle water tank. You steer 253°T at 4.3 kn through the water. At 1240 a new fix puts you 217°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1240 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 0835 your fix is 309°T, 3.7 nm from Tern Island tower. You steer 198°T at 4.9 kn through the water. At 0925 a new fix puts you 078°T, 3.5 nm from Westfield church spire.

   Plot the 0925 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  

8. At 1025 your fix is 282°T, 1.0 nm from Gannet Rock daybeacon. You steer 071°T at 8.6 kn through the water. At 1055 a new fix puts you 056°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1055 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