OOW Essentials

OOW Essentials is a practical maritime training and navigation toolkit designed for deck officers, cadets and seafarers who want essential bridge tools in one place.

The app combines professional reference tools, calculators, training modules and celestial navigation features in a clean and easy-to-use interface.

Whether you are preparing for exams, revising bridge procedures, planning a passage or practising celestial navigation, OOW Essentials gives you quick access to the tools you need.

Key features include:

• Celestial Navigation

Use advanced celestial navigation tools for the Sun, Moon, planets and navigational stars.

• Star Finder

Identify visible navigational stars based on your position, date and UTC time.

• Best Stars Now

Find suitable stars for a celestial fix based on altitude, azimuth and visibility.

• Sight Reduction

Calculate GHA, declination, LHA, Hc, Zn and intercept using the intercept method.

• LOP Plotter

Plot two or three Lines of Position and calculate a celestial fix.

• Sextant Training

Learn how sextant observations are corrected from Hs to Ho, including index correction, dip, refraction, semi-diameter and parallax.

• Celestial Simulator & Exam

Practise realistic celestial navigation questions and view step-by-step worked solutions.

• Nautical Almanac Tools

Access calculated celestial body positions, rise and set times, twilight information and related astronomical data.

• Celestial Navigation Training

Learn the principles behind GHA, SHA, declination, LHA, assumed position, intercepts, position lines, sextant use, star selection, meridian passage and more.

• Passage Planning

Support your voyage preparation with practical passage planning tools and maritime reference information.

• Port to Port

Calculate routes and distances between ports using the integrated navigation database.

• Great Circle Navigation

Calculate great-circle routes, distances and navigation information.

• ETA and Navigation Calculators

Use practical bridge calculations for everyday navigation and voyage planning.

• Maritime Reference Tools

Keep important navigation and officer-of-the-watch information available in one place.

FREE TO DOWNLOAD

OOW Essentials can be downloaded and used for free. Selected tools include limited free uses so you can explore the app before upgrading.

LIFETIME PREMIUM

Unlock OOW Essentials Lifetime Premium with a single one-time purchase.

Premium includes:

• Unlimited use of all tools

• Access to all features

• Full training content

• No subscription

• Lifetime access

OOW Essentials is designed to support learning, training and voyage preparation. It is not a replacement for approved navigational equipment, official charts, nautical publications, company procedures or the professional judgement of the officer in charge of the navigational watch.

!IMPORTANT!

Always verify critical navigation information using approved onboard systems and official sources.