10.8.3. Depth Corrections

Try these first

1. 1.

   What are tidal corrections?

   Hint

   Think about what influences water levels.

2. 2.

   Name a type of vessel motion.

   Hint

   These affect how the vessel moves.

3. 3.

   What is the purpose of tidal corrections in hydrographic surveying?

   • A) To measure tidal currents
   • B) To adjust depth readings for tidal influences
   • C) To estimate vessel speed

   Hint

   Focus on how tides can change water levels.

4. 4.

   True or False: Vessel motion does not affect depth measurements.

   • True
   • False

   Hint

   Think about what happens when a boat is on rough waters.

5. 5.

   If the tide reading is 1.5 feet, the original depth measured is 12 feet, and the vessel has a heave of 0.75 feet, what is the adjusted depth?

   Hint

   Make sure to subtract the tide reading and add the heave.

6. 6.

   Explain how vessel motion would affect the accuracy of depth readings in a dynamic weather situation such as a storm.

   Hint

   Consider how movement can skew the measurements.