---
title: "Trilateration Position Calc - Reviews, Revenue and Downloads in Brazil | Apple App Store"
description: "Built for surveyors, accident reconstructionists, and field engineers who need a quick three-point position solve - not a CAD package, not a desktop tool.  WHAT IT DOES Solves for a 2D position given "
---

# Trilateration Position Calc — Brazil

![Trilateration Position Calc App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/0e/08/72/0e087237-b9a7-5f69-a4df-50cfcae7fc49/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Shanghai Sheyuan Network Technology Co](https://apptail.io/developer/shanghai-sheyuan-network-technology-co-mkXe)
**Category:** Utilities
**Rating:** N/A (0 ratings)
**Price:** 12.90 R$
**Bundle ID:** com.sy.trilatcalc
**Store:** Apple App Store
**Country:** Brazil
**Version:** 1.0.3 (released 2026-07-01)
**Original Release:** 2026-04-08
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/br/app/app/id6761745770)
**AppTail Page:** [https://apptail.io/app/trilateration-position-calc-Rbvz/brazil](https://apptail.io/app/trilateration-position-calc-Rbvz/brazil)

## Trilateration Position Calc Description
Built for surveyors, accident reconstructionists, and field engineers who need a quick three-point position solve - not a CAD package, not a desktop tool.

WHAT IT DOES
Solves for a 2D position given three reference points and three measured distances. Uses circle-intersection algebra (two-candidate nonlinear solution) plus a linearized 2x2 reduced system as cross-check. Plots all three reference circles and both candidate solutions on a 2D canvas with tolerance rings and per-anchor distance-error verification.

INPUTS
- Three reference points: (x1, y1, r1), (x2, y2, r2), (x3, y3, r3)
  x, y in any consistent unit (feet, meters, mm - your choice)
  r is the measured distance from each reference point to the unknown
- Tolerance for solution validity (default 0.001)

RETURNS
- Solution 1 and Solution 2 (x, y) from the nonlinear solve
- Linearized solution from the 2x2 reduced system
- Linearized determinant value (flags degenerate / parallel cases)
- Per-solution distance verification: actual vs. expected, error
- Validity flag for each candidate based on tolerance

WHY THIS APP, NOT THE FREE ONES
- Math is shown - both solve methods rendered, not just the final coordinates.
- Visual cross-check - 2D plot of anchor circles, candidates, and tolerance rings.
- Works offline - staking jobs, accident scenes, GPS-shadow zones.
- No login. No ads. No telemetry. No subscription.

PRICING
$1.99. Pay once, own it. Lifetime access on iPhone, iPad, and Mac via Family Sharing.

NOT A SUBSTITUTE FOR
PLS-stamped boundary survey work. Geodetic-grade total stations or RTK GPS for legal coordinates. This is a quick verification tool - not legal-survey-grade equipment.

## Trilateration Position Calc Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/90/d2/eb/90d2eb73-5fd2-4582-6b02-82404b929dba/screenshot_iphone_1.jpg/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/ff/97/1e/ff971ed1-b43b-38de-7426-96882883e57b/screenshot_iphone_2.jpg/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/0e/34/02/0e3402ff-1fe3-084f-6d8d-d1f53d0a347d/screenshot_iphone_3.jpg/1284x2778.png)








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