Worksheet 128 · Skill 5

Set and drift

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1. At 1350 your fix is 071°T, 3.5 nm from Westfield church spire. You steer 137°T at 4.0 kn through the water. At 1425 a new fix puts you 264°T, 2.4 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1100 your fix is 352°T, 1.1 nm from Kittle water tank. You steer 271°T at 4.0 kn through the water. At 1210 a new fix puts you 017°T, 2.4 nm from Mill stack.

   Plot the 1210 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  

3. At 1030 your fix is 029°T, 2.5 nm from Mill stack. You steer 111°T at 4.7 kn through the water. At 1100 a new fix puts you 175°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1100 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  

4. At 1005 your fix is 018°T, 1.6 nm from Kittle water tank. You steer 269°T at 4.6 kn through the water. At 1040 a new fix puts you 206°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1040 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 1600 your fix is 341°T, 1.7 nm from Heron Point Light. You steer 109°T at 6.7 kn through the water. At 1630 a new fix puts you 344°T, 2.3 nm from Mill stack.

   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  

6. At 0710 your fix is 102°T, 2.1 nm from Westfield church spire. You steer 091°T at 7.9 kn through the water. At 0750 a new fix puts you 275°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 0750 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  

7. At 1030 your fix is 255°T, 2.9 nm from Tern Island tower. You steer 217°T at 5.3 kn through the water. At 1110 a new fix puts you 059°T, 2.2 nm from Heron Point Light.

   Plot the 1110 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 0945 your fix is 004°T, 2.9 nm from Mill stack. You steer 350°T at 6.5 kn through the water. At 1030 a new fix puts you 325°T, 2.3 nm from Tern Island tower.

   Plot the 1030 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