# Survey Datum Ledger

> Survey Datum Ledger (iPhone/iPad app by Lola Winhard.)

- Source: https://appshunter.io/ios/app/survey-datum-ledger/id6806218290 (this page in markdown: same URL + `.md`)
- Developer: [Lola Winhard](https://appshunter.io/developer/1803579664)
- Category: Utilities
- Price: Free
- Age rating: 9+
- Requires: iOS 16.0 · 22 MB
- Languages: American English
- Released: 2026-08-31
- Data updated: 2026-09-14
- User reviews in markdown: https://appshunter.io/ios/app/survey-datum-ledger/id6806218290/reviews.md

## What is Survey Datum Ledger?

Survey Datum Ledger is a practical field archive for discovering, documenting, and studying survey markers, benchmarks, monuments, and historic geodetic reference points.

Record each find with a photograph, marker type, identification details, and location data. Classify triangulation stations, elevation benchmarks, azimuth marks, boundary monuments, datum plates, witness posts, and other surveying references in one organized ledger.

Explore technical details such as datum systems, ellipsoid information, stamped inscriptions, marker condition, construction type, and historical references. Document whether a marker is clearly preserved, weathered, corroded, damaged, or partially hidden.

Use the interactive geodetic view to examine recorded points and visualize how reference markers relate across the map. Additional tools help estimate Earth curvature, atmospheric refraction, and apparent target displacement from line-of-sight measurements.

An archive completeness indicator helps you spot missing information before an entry is finished.

Built for surveyors, geodesy enthusiasts, map researchers, field explorers, and anyone interested in preserving the physical reference points that helped define our maps.


## Version history (last 1 release)

### 1.0 — 2026-08-31

No release notes.

## More apps by Lola Winhard

- [Vintage Radio Catalog](https://appshunter.io/ios/app/vintage-radio-catalog/id6748308460)

All apps by Lola Winhard: https://appshunter.io/developer/1803579664

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-14.*