Sightloom: Celestial Nav

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

Sightloom: Celestial Nav is a focused, fully on-device app. A complete offline celestial-navigation workbench for sextant correction, almanac interpolation, sight reduction, running fixes, intercept plots, and voyage logs.

KEY 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
• Editable complete sample and local project persistence
• CSV input plus local PDF and data export
• Fifty-two original offline reference plates

ONE-TIME AND PRIVATE

• One paid download; no subscription or in-app purchase
• No account, advertising, analytics, tracking, or developer-operated backend
• Core features and bundled content work offline
• Work remains on device unless you deliberately share or export it through an Apple system interface

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