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 (69)
✍️ Sample CH Questions & Answers
1. A hydrographer notices that a restored reach has a sinuosity ratio of 1.05. What does this indicate?
A sinuosity ratio near 1.0 indicates an almost straight channel; reference reaches for the same valley slope typically have higher sinuosity.
2. What is multi-factor authentication in CH security?
MFA requires multiple verification factors (knowledge, possession, biometrics), significantly reducing unauthorized access.
3. What is change management in CH technology?
IT change management ensures changes are evaluated, approved, tested, and implemented in a controlled manner.
4. A geodetic baseline measured along the Earth's surface is 10 000 m. What type of line connects the two endpoints with the shortest path on the ellipsoid?
A geodesic (or geodetic line) is the shortest path between two points on the surface of an ellipsoid, analogous to a great circle on a sphere.
5. What is the purpose of the S-57 Object Catalog in hydrographic GIS?
The S-57 Object Catalog (IHO Publication S-57 Appendix A) defines the complete dictionary of feature classes and attributes allowed in Electronic Navigational Charts.
6. Which motion sensor parameter, if incorrectly measured, would cause a depth error that increases with heave amplitude but is independent of swath angle?
Heave errors directly add or subtract from measured depth values uniformly across all beams, independent of beam angle.