Sightloom

Offline sights and fixes

Purpose-Built

A complete offline celestial-navigation workbench for sextant correction, almanac interpolation, sight reduction, running fixes, intercept plots, and voyage logs.

Core Features

Observed-to-apparent altitude correction ledger
Computed altitude, azimuth and intercept
Two- and three-sight running-fix workspace
Offline almanac interpolation examples
Voyage log and PDF handoff

Private by Design

No account, subscription, ads, tracking, third-party analytics, or developer-operated backend. Core features work offline, and your work stays on device unless you deliberately share or export it.

Use It Responsibly

Training and cross-checking aid only. Maintain an approved almanac, tables, chronometer practice and primary navigation system.