COGO — bearing, distance & area
COGO Calculator — Bearing, Distance & Area
Join, radiate and polygon area from grid coordinates, with the full working shown for every step — including the grid-vs-ground area note. Free advisory working aid.
Field tools · free · advisory
Field tools
Free, browser-based working aids for everyday survey arithmetic — joins and areas, grid–ground distances, traverse and level closures, point-file checks and datum sanity. Every tool shows the full working under its result and cites the reference it works from. All of it is advisory: review aids for you to re-check, never a professional decision.
Grid ↔ ground (CSF)
Grid ↔ Ground Converter — Combined Scale Factor
Point and line scale factor, height factor and combined scale factor for MGA2020 — convert grid and ground distances both ways with the full working shown.
Traverse misclose
Traverse Misclose Checker
Linear and angular misclose, relative precision and an advisory Bowditch comparison. Tolerance guidelines are read from loaded advisory rule packs, never hardcoded.
Level loop closure
Level Loop Closure Checker
Loop misclose against a selectable, cited C√K guideline (12√K third-order convention by default) with advisory distribution and the full working shown.
Point file validator
Point File Validator
Checks CSV/TXT point files for duplicate ids, coincident points, easting/northing order and zone-extent sanity — parsed entirely in your browser; your file never leaves this page.
Coordinate & datum converter
Coordinate & Datum Converter — MGA2020
Geographic ↔ MGA2020 grid with zone, point scale factor and grid convergence shown, an optional GDA94 → GDA2020 step, and a copyable method statement for every result.
Deliverable checklist
Deliverable Checklist Generator
A printable, per-state checklist of questions to ask before a survey package leaves the office. Advisory prompts only — it never decides anything for you.
Datum quick-check
Datum & Metadata Quick-Check
Paste header blocks from project files to compare datum, zone, geoid and epoch declarations in one consistency table. Advisory — confirm against the source files.
Every result on these pages is advisory and unverified — not for survey deliverables. Tools compute from the inputs you provide and show their working, and where a guideline applies they only ever say “within guideline” or “exceeds guideline — review”. Registered surveyor confirmation required before reliance.
Safety & scope
SurveyMarkup does not certify survey accuracy, cadastral compliance, legal boundaries, or coordinate correctness. It helps prepare and review working information, but original data and final outputs must be checked by a qualified user before use.
Assistance only - professional review remains required.