FS Study Guide 2026
Everything you need to pass the FS 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.
📋 FS Exam Format at a Glance
📚 FS Topics to Study (21)
✍️ Sample FS Questions & Answers
1. What is a Benchmark (BM)?
Explanation: A benchmark (BM) is a point of known elevation. It is a reference point used in surveying and construction to establish vertical measurements. By knowing the elevation of a benchmark, surveyors can accurately determine the elevation of other points in the area. This helps in ensuring that structures are built at the correct height and that accurate measurements are taken for various purposes.
2. What does PDOP measure in GPS quality assessment?
PDOP (Position Dilution of Precision) describes the combined effect of satellite geometry on 3D positional accuracy.
3. The arc length (L) of a simple horizontal curve with radius R and central angle Δ expressed in radians is:
Arc length equals the radius multiplied by the central angle in radians: L = R × Δ.
4. A crest vertical curve is used when:
A crest (summit) vertical curve occurs when the algebraic difference in grades produces a curve that is concave downward, connecting a positive grade to a negative or flatter grade.
5. What does the term 'sounding' refer to in hydrographic surveying?
A sounding is a measurement of water depth at a specific location, referenced to a chart datum and plotted on nautical charts.
6. The rights of a landowner whose property abuts a flowing river are known as:
Riparian rights pertain to landowners whose property is adjacent to a flowing body of water, like a river or stream. Littoral rights apply to landowners whose property borders a static body of water, such as a lake or ocean. Avulsion is the sudden change in a river's course and relates to how boundaries are affected, but it is not the name of the rights themselves. Subsurface rights relate to ownership of resources below the ground.