MA Land Surveyor common mistakes
MA Land Surveyor · Understand the traps and how to avoid them.
Treating the Massachusetts coordinate systems (MASSGIS Mainland and Island zones) as if they were a single statewide grid, and applying a single scale factor or combined factor across the whole project without checking which zone the parcel falls in or whether a zone boundary crosses the tract.
Candidates study the state plane concept generically and assume one zone per state, as in many smaller states. Massachusetts uniquely has two zones split by a defined boundary, and the exam tests whether you know the boundary and the consequences for a parcel that straddles it.
What to do instead
Memorize the Mainland/Island zone boundary description and practice computing grid-to-ground combined factors (scale factor times elevation factor) for sample points in each zone. For any boundary-straddling problem, compute the factor separately for each side and state explicitly that a single factor is invalid there.
Confusing the record bearing basis with the magnetic or grid basis when retracing a deed, and then reporting a misclosure or area that reflects the wrong orientation rather than the actual geometric problem.
Deeds are frequently written in a record basis (often referenced to a prior survey or a magnetic observation of the era) while the retracement data are on grid or true north. Candidates rotate the whole traverse to the wrong basis and then chase a phantom error.
What to do instead
Before computing anything, identify the stated basis of each record call, list the rotation between record basis and your working basis, and rotate record bearings into the working basis as a documented first step. If the basis is unstated, test both hypotheses and compare closure; report which basis you adopted and why.
Computing a boundary line by scaling from a plan or by trusting a single proportional measurement instead of running the full coordinate geometry, so that a proportioned or prorated line is solved with rounded intermediate values and fails the closure check.
Under time pressure, candidates take shortcuts, round bearings to the nearest minute and distances to the nearest foot early, then propagate those rounded values through the traverse. The arithmetic looks right but the closure is off by amounts the exam is specifically testing.
What to do instead
Carry coordinates and bearings to at least the precision of the record data (typically seconds and hundredths of a foot or millimeter) and round only at the final answer. Always close the traverse as an independent check and compare misclosure against an explicit tolerance before reporting a boundary position.
Applying the wrong legal doctrine to a boundary problem: invoking adverse possession where the facts describe a boundary by acquiescence or estoppel, or invoking practical location where the facts describe a disputed written boundary with an ambiguity to resolve.
The doctrines overlap factually and candidates memorize labels without the elements. Each doctrine has distinct required elements (period and hostility for adverse possession, mutual recognition and a defined line for acquiescence, reliance and detriment for estoppel), and the exam supplies facts that satisfy only one.
What to do instead
Build a one-page element checklist for each doctrine (adverse possession, prescription, acquiescence, estoppel, practical location, agreed boundary) and, on each question, write down which elements the facts supply and which are missing before choosing. Eliminate any doctrine whose elements the facts do not fully support.
Misapplying the rules of construction for deed descriptions, such as preferring a call for distance over a call for a monument, or treating a call for an adjoiner as controlling when the adjoiner's deed does not support it.
Candidates recall fragments of the hierarchy (monuments over courses and distances, natural monuments over artificial, etc.) but not the ordering or the exceptions, and they apply the hierarchy mechanically without checking whether the monument actually exists and is identifiable.
What to do instead
Memorize the standard hierarchy and its qualifications, then practice on descriptions containing conflicting calls. For each conflict, state which call controls, cite the reason (existence and certainty of the monument, consistency with the adjoiner), and note that an uncertain or misplaced monument loses its priority.
Skipping the field-to-finish or data-reduction check: accepting coordinates from the field controller or CAD file without verifying instrument height, target height, prism constant, and atmospheric correction, and without reviewing the raw observations for blunders.
Modern workflows make it easy to treat the reduction as a black box. Exam questions embed a single wrong instrument height, a mismatched prism constant, or an uncorrected temperature/pressure entry, and the resulting coordinate shift is the point of the question.
What to do instead
Adopt a fixed reduction checklist: HI, HT, prism constant, scale factor, atmospheric correction, and a raw-data blunder scan. Practice computing the coordinate effect of a one-unit error in each parameter so you can recognize the signature of each mistake in a set of answers.
Conflating accuracy and precision when specifying equipment or evaluating a survey, for example claiming a total station is 'more accurate' because its displayed resolution is finer, or reporting a standard deviation as if it were a maximum error.
The terms are used loosely in practice and candidates carry that looseness into the exam. Specifications such as 2 mm + 2 ppm describe a precision (random error) model, not a guarantee of accuracy, and the distinction drives instrument selection and acceptance decisions.
What to do instead
Define accuracy (closeness to truth) and precision (repeatability) explicitly, and for any instrument specification identify which one it describes. Practice converting a stated standard deviation into a confidence interval and compare it against a project tolerance before concluding a method is adequate.
Performing an adjustment without checking redundancy or without examining residuals: distributing a misclosure blindly across all measurements equally, or accepting an adjustment when a single observation is a gross outlier.
Candidates learn the compass rule and least squares as procedures and apply them regardless of whether the observations are of equal quality or whether residuals reveal a blunder. Equal distribution hides the outlier the question is testing.
What to do instead
Before adjusting, state the redundancy and the expected misclosure from the observation precision. After adjusting, inspect residuals against their expected magnitudes, identify any observation whose residual is an outlier, and justify any weighting scheme (for example, inverse-variance weights) rather than defaulting to equal distribution.
Ignoring the distinction between a survey that establishes a boundary and a survey that retraces one, and issuing a boundary opinion or setting monuments on a retracement without first exhausting the record evidence and field evidence of the original corners.
Candidates conflate the surveyor's role in an original survey (creating a boundary) with the role in a retracement (recovering an existing one). This leads to answers that 'correct' a record boundary or set new corners where the original corner should be sought.
What to do instead
State the role explicitly for each problem: original survey versus retracement. For retracements, follow the evidence hierarchy (original monuments, then evidence of original position, then record calls, then proportioning) and never set a corner that contradicts recovered original evidence without documenting why.
Failing to account for datum and epoch in GNSS-derived positions: mixing NAD83 realizations or epochs, or combining GNSS vectors with terrestrial observations without a proper transformation, and reporting coordinates to a precision the datum does not support.
GNSS coordinates are tied to a specific reference frame and epoch, and coordinates from different realizations differ by amounts that matter at survey accuracy. Candidates treat 'NAD83' as a single fixed thing and combine data sets naively.
What to do instead
Record and state the reference frame, realization, and epoch for every GNSS-derived coordinate. Practice transforming between realizations and epochs, and always apply the correct projection and combined factor before mixing with terrestrial data. Report coordinates only to the precision justified by the control and the datum.