Worksheet 733 · Skill 5

Set and drift

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1. At 0920 your fix is 294°T, 1.5 nm from Tern Island tower. You steer 186°T at 6.8 kn through the water. At 1010 a new fix puts you 015°T, 2.8 nm from Mill stack.

   Plot the 1010 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  

2. At 1025 your fix is 300°T, 4.5 nm from Tern Island tower. You steer 152°T at 4.6 kn through the water. At 1140 a new fix puts you 246°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1140 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  

3. At 0850 your fix is 045°T, 3.9 nm from Westfield church spire. You steer 177°T at 7.4 kn through the water. At 0940 a new fix puts you 004°T, 1.8 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1415 your fix is 004°T, 2.8 nm from Westfield church spire. You steer 147°T at 8.2 kn through the water. At 1515 a new fix puts you 059°T, 2.1 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1230 your fix is 126°T, 1.9 nm from Westfield church spire. You steer 091°T at 8.9 kn through the water. At 1310 a new fix puts you 266°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1310 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 0750 your fix is 029°T, 1.1 nm from Westfield church spire. You steer 113°T at 9.0 kn through the water. At 0910 a new fix puts you 012°T, 1.1 nm from Kittle water tank.

   Plot the 0910 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  

7. At 1100 your fix is 311°T, 1.9 nm from Tern Island tower. You steer 259°T at 4.9 kn through the water. At 1210 a new fix puts you 055°T, 3.0 nm from Westfield church spire.

   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  

8. At 0720 your fix is 047°T, 4.4 nm from Westfield church spire. You steer 187°T at 6.1 kn through the water. At 0800 a new fix puts you 021°T, 2.9 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn