NSPS Certified Survey Technician Level I common mistakes
NSPS Certified Survey Technician Level I · Understand the traps and how to avoid them.
Reading the wrong graduation on a leveling rod (for example, reading the meter/decimeter digit instead of the centimeter digit) and carrying that misread through the whole reduction.
Rod graduations are dense and the candidate is under time pressure, so the eye locks onto the boldest line rather than the one aligned with the crosshair.
What to do instead
Before the exam, practice reading rod sections until each graduation is automatic; during the exam, estimate the reading twice (top-down and bottom-up) and reconcile before writing it down.
Confusing backsight, foresight, and height of instrument in a differential leveling reduction, so the elevation is computed with the wrong sign or the wrong shot.
The arithmetic is simple but the role of each shot flips depending on where the instrument stands, and candidates memorize formulas without tracking the setup order.
What to do instead
Sketch each setup as a small diagram (HI = known elevation + BS; new elevation = HI - FS) and label every shot before touching the calculator.
Applying the wrong sign convention to an angle or bearing (for example, treating a bearing as a deflection angle or reversing a quadrant), producing a misclosure that looks like an arithmetic error.
Bearings, azimuths, and deflection angles all describe direction but are converted differently, and candidates pattern-match on the number rather than the label.
What to do instead
Write the definition of the quantity next to the value before converting (azimuth measured clockwise from north; bearing measured from the nearest cardinal), then check the quadrant of the result.
Failing to close a traverse computation (sum of latitudes and departures not driven to zero) and reporting coordinates that disagree with the given data.
Candidates stop when the numbers 'look right' instead of performing the closure check, and small sign errors hide until the end.
What to do instead
Always compute sum of latitudes and sum of departures and compare to zero (or apply the stated adjustment) before finalizing any coordinate answer.
Mixing units within a single calculation, such as entering a distance in feet while using a metric instrument constant or a chain length in chains.
Surveying problems draw on older units (chains, links, rods) alongside metric and US survey feet, and candidates convert only the first number they see.
What to do instead
Convert every given value to one working unit at the start of the problem, write the conversion factors used, and convert back only at the end.
Misidentifying the instrument station or the occupied point when setting up a total station problem, leading to an angle measured from the wrong reference.
The problem describes a field setup in prose, and candidates skip the mental picture of which point is occupied and which is backsighted.
What to do instead
Draw the station, backsight, and foresight as three labeled points before computing, and state the reference direction explicitly.
Ignoring instrument and target height when reducing trigonometric or total-station elevations, so the computed elevation is off by the height difference.
These corrections are small and easy to drop, and candidates treat the slope distance as if it ran from the ground point.
What to do instead
Write the full elevation formula including HI and HT, and circle each height term in the problem statement before substituting.
Using the wrong horizontal-distance versus slope-distance relationship, applying a cosine correction where a sine is required or vice versa.
Zenith angles, elevation angles, and vertical angles are all measured from different references, and candidates plug in the angle without checking its reference.
What to do instead
Convert every vertical angle to a single reference (zenith from vertical) first, then apply the standard formula and sanity-check that horizontal distance is never greater than slope distance.
Answering boundary and legal-principle questions from general intuition rather than the controlling principle (for example, choosing 'equitable' over the priority of a written record).
The office track includes boundary and evidence questions where the 'fair' answer is not the legally controlling one, and candidates have not reviewed the hierarchy of evidence.
What to do instead
Review the order of evidence (written record, then monuments, then measurements) and answer from that hierarchy, not from what seems reasonable.
Running out of time by re-deriving basic formulas (area by coordinates, coordinate geometry) from scratch on every problem instead of using them directly.
Candidates have not practiced the standard computations enough to recall them under pressure and spend minutes rebuilding each one.
What to do instead
Drill the small set of core formulas (area by coordinates, inverse between points, leveling reduction) until they are automatic, and skip any question that stalls for more than a couple of minutes, returning to it later.