CH Study Guide 2026
Everything you need to pass the CH exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CH Exam Format at a Glance
📚 CH Topics to Study (21)
✍️ Sample CH Questions & Answers
1. What is multi-factor authentication in CH security?
MFA requires multiple verification factors (knowledge, possession, biometrics), significantly reducing unauthorized access.
2. What is change management in CH technology?
IT change management ensures changes are evaluated, approved, tested, and implemented in a controlled manner.
3. Satellite radar altimetry contributes to hydrography and geodesy primarily by providing:
Radar altimeters precisely measure sea surface height relative to a reference ellipsoid; these measurements underpin mean sea level determination, geoid modeling, and ocean circulation studies.
4. Which orbit type do most hydrographic Earth observation satellites use to achieve consistent global coverage?
Sun-synchronous LEO orbits ensure the satellite crosses each latitude at the same local solar time, providing consistent illumination conditions and global coverage with frequent revisits.
5. What is multi-factor authentication in CH security?
MFA requires multiple verification factors (knowledge, possession, biometrics), significantly reducing unauthorized access.
6. According to USGS Techniques and Methods 3-A22, the recommended minimum number of transects for a standard ADCP discharge measurement is:
USGS guidance recommends a minimum of four transects (two in each direction) to obtain a reliable mean discharge estimate and assess measurement repeatability.