Celestial → New Observation; prepare UTC, DR position, selected body and current sextant/environment inputs.
STEP-BY-STEP GUIDE
Record and reduce celestial sights
Create observations with UTC time, DR position, body and sextant inputs; apply corrections, reduce sights and combine LOPs into a fix. Use quick calculators for repeatable bridge checks and save key results.
Before you start
Celestial → New Observation; prepare UTC, DR position, selected body and current sextant/environment inputs.
App steps
- Celestial → New Observation; prepare UTC, DR position, selected body and current sextant/environment inputs.
- Enter sextant altitude, index correction, height of eye, pressure and temperature; use a clearly labelled example sight.
- corrected Ho, computed Hc, intercept, Zn and line of position are shown with the selected time and body; combine compatible sights for a fix.
- Resolve time, body, ephemeris and input warnings before saving. Cross-check with the current official nautical almanac and established procedures.
See the main screens
Enter sextant altitude, index correction, height of eye, pressure and temperature; use a clearly labelled example sight.
corrected Ho, computed Hc, intercept, Zn and line of position are shown with the selected time and body; combine compatible sights for a fix.
Resolve time, body, ephemeris and input warnings before saving. Cross-check with the current official nautical almanac and established procedures.
Practical learning and web tools
What you'll see
Resolve time, body, ephemeris and input warnings before saving. Cross-check with the current official nautical almanac and established procedures.
CaptainCalc is decision support. It never replaces approved stability data, loading computers, ECDIS, official publications, procedures or professional judgment.
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