# COGO Survey Calculator > Traverse, closure & CAD export Canonical page: [https://chrome-stats.com/d/id6777398516](https://chrome-stats.com/d/id6777398516) ## Overview - **ID:** `id6777398516` - **Platform:** Apple - **Type:** Apple app - **Status:** Available - **Publisher:** Gabriel John Fordan - **Category:** Productivity - **Rating:** 5.00 / 5 (1 ratings) - **Version:** 2.1 - **Last updated:** 2026-09-05 - **First published:** 2026-06-10 - **Size:** 8.29 MB - **Data as of:** 2026-09-18 - **Store listing:** [Apple App Store](https://apps.apple.com/us/app/cogo-survey-calculator/id6777398516) - **Website:** [https://cogo.vendrato.com](https://cogo.vendrato.com/) - **Privacy policy:** [https://cogo.vendrato.com/privacy](https://cogo.vendrato.com/privacy) ## Description v2.1: azimuth or quadrant misclosure display, editable legs, metres/feet/links per leg, Line Tools, Common Tangent, Two Unknowns, and Recessed Invert. Native COGO calculator for surveyors and field crews — traverse, closure, curves, intersections, area, and CAD export. Fully offline. WHAT YOU CAN DO • Bearing-and-distance traverse with running coordinates; edit any leg in place; enter legs in metres, feet, US survey feet, or links • Inverse / join: two points to distance, azimuth, and quadrant bearing • Inverse list / radiations: bearing & distance from one point to every other point • Sideshot reduction: horizontal angle, zenith, and slope distance to northing, easting, and elevation • Closure: linear misclosure, misclosure bearing as azimuth or quadrant (your choice), precision ratio (1 : N) • Balance a traverse by the Compass (Bowditch) or Transit rule • Enclosed area by coordinates, with acres / hectares and perimeter • Horizontal curve solver — R, Δ, arc, tangent, chord, external, mid-ordinate, degree of curve, PC & PT — plus a deflection / chord stakeout table (CSV) • 3-point circle / arc — fit a circle through three points and divide the arc into stake points • Angle calculator — add/subtract angles, angle between two bearings, bearing ± angle, editable running total • POB calculator — chain editable bearing-distance calls from a point of beginning • COGO intersections — bearing-bearing, bearing-distance, distance-distance — and 3-point (Tienstra) resection • Line tools — four-point intersection, parallel and perpendicular lines with station, offset, and left/right • Common tangent — all four tangents between two circles from two centres or a bearing + distance, with offsets • Two unknowns — solve two missing traverse distances, bearings, or one of each, offsets included • Recessed invert — reduce a slant tape shot to pipe invert depth and elevation • UTM converter — latitude/longitude as decimal degrees, DMS with N/S/E/W, DDMMSS, or packed D.MS • State Plane (SPCS83 and SPCS2022 preview) — lat/lon to grid with scale factor, convergence, and combined factor • Grid ↔ Ground converter — distances through a typed or zone-derived combined scale factor • Horizontal alignment — PI-chained tangents, curves, optional spirals, stationing, station & offset, stakeout • Predetermined / hinged area subdivision — parallel cutoff or hinged line to a target area • Metes-and-bounds legal description — generate a written deed description from a closed traverse • Plot / sketch view of the traverse with north arrow, scale bar, and legend • Import/export points as CSV in your column layout (PNEZD, PENZD, NEZ, ENZ …) and delimiter • Export DXF (AutoCAD R12) and a one-page PDF report — CSV, DXF, and PDF export are free • Work in DMS, decimal, or packed D.MS; azimuth or quadrant; feet or metres — set your defaults once • Native iOS keyboard by default, or the in-app survey keypad with dedicated DMS keys • Ask “Theo,” the on-device AI assistant (Apple Intelligence), in plain English PRIVATE BY DESIGN 100% offline. No account, no network, no ads, no tracking. Your jobs and points never leave your device. WHO IT'S FOR Land surveyors, party chiefs, survey techs, civil engineers, and students. FREE & PRO Free includes one job and up to ten points, full on-screen computation, and CSV / DXF / PDF export. COGO Pro unlocks unlimited jobs and points, Compass/Transit closure adjustment, and enclosed-area output — as a Weekly, Monthly, or Yearly subscription, or a one-time Lifetime purchase. Always verify computed results against your project control. This app is a field calculator, not a substitute for a licensed surveyor's checks. SUBSCRIPTION DETAILS COGO Pro Weekly, Monthly, and Yearly are auto-renewable subscriptions; Lifetime is a one-time purchase. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel anytime in Settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://cogo.vendrato.com/privacy ## Rankings - #831,555 — Overall ## Similar extensions and apps - [Handy Surveying](https://chrome-stats.com/d/id1575016601) — 1.00 / 5 - [Cogo Surveying](https://chrome-stats.com/d/id1139428658) — 3.10 / 5 - [survAIor](https://chrome-stats.com/d/id6760598652) — 5.00 / 5 - [HARLO SurveySuite](https://chrome-stats.com/d/id6764359279) — 5.00 / 5 - [Engineering Survey Calculator](https://chrome-stats.com/d/id641965073) — 5.00 / 5 - [Pocket Surveyor](https://chrome-stats.com/d/id6786966754) - [MapLab Survey - GIS, CAD, Land](https://chrome-stats.com/d/id6760623664) — 5.00 / 5 - [Kocaman Pro](https://chrome-stats.com/d/id1090646472) — 1.00 / 5 - [Survey C-Plus: AutoCAD Export](https://chrome-stats.com/d/id6756013455) - [Survey One: Survey to AutoCAD](https://chrome-stats.com/d/id6755945244) - [Survey Coordinate Helper2026](https://chrome-stats.com/d/id6779731676) - [CAD-Locator](https://chrome-stats.com/d/id1532756928) — 4.30 / 5 --- Source: [Chrome-Stats](https://chrome-stats.com/d/id6777398516)