ezSights Celestial Navigation

ezSights Celestial Navigation

By EZ Celestial LLC

  • Category: Navigation
  • Release Date: 2012-04-02
  • Current Version: 11.1.1
  • Adult Rating: 4+
  • File Size: 24.78 MB
  • Developer: EZ Celestial LLC
  • Compatibility: Requires iOS 8.2 or later.
Score: 4.5
From 15 Ratings


Please check out www.ezCelestial.com for a full description of the application and in-app help pages. ezSights is a complete celestial navigation package for the iPhone®, iPod touch® and iPad®. It provides simple interfaces for entering sight parameters, planning the navigational bodies to use and time of day to make the observations, and entering the observations made using a sextant. Then with the click of a button a fix is determined from the observations made. Features ▪ Internally calculated Nautical Almanac values, valid through 2059. ▪ Performs all calculations with same algorithms used by the US Naval Observatory for the Nautical Almanac. ▪ Supports all navigational bodies currently referenced in the Nautical Almanac. ▪ Computes rise and set times for the sun and moon. ▪ Computes moon phase, HP, parallax and semi-diameter. ▪ Animated star map to aid in locating and identifying all navigational bodies. ▪ Display of full day, morning, or evening altitude profiles for all navigational bodies. ▪ Save current data and up to 7 previous fixes. Each session can have up to 25 observations on up to 3 navigational bodies. ▪ Supports running fixes. ▪ 2 different methods for determining a fix. ▪ Supports practice sights using a bubble horizon, artificial horizon, or large body of water using dip short. ▪ Integration with iOS® Maps to display saved fixes. Also supports setting the assumed position by dropping a pin on the map. ▪ Integration with iOS® location services to obtain position and magnetic variance. ▪ Integration with iOS® devices with compass for direction-up display of the star map and to show azimuth of object currently being observed. ▪ Integration with iOS® data network for setting UTC time from network time using NTP servers.



  • Great for learning

    By cjtst11
    I don't have enough experience with this app yet to give it a full 5 stars but so far it has been quite good. The tutorial functions are really nice and built in, step-by-step scenario instructions will have you getting your first fixes from either the sun or stars quickly. I will re-evaluate one I have had more time with ezSights.
  • Excellent Ap

    By RCP12345
    Very well thought out ap. I have recently completed a cell nav class and purchased a sextant. This will be the ap I use to practice my skills.
  • Great App

    By Lworley1
    I'm learning celestial navigation and this app has made it a lot easier to grasp the concepts of navigating without a GPS.
  • Great Nav tool

    By S/V Red Sky
    Bought this to 'learn' how to use my sextant. Really helpful app. Good help tutorial. Plenty of features, some that I'm still learning how to best utilize. Would I buy it again? YES !
  • Very nicely done

    By Sharpiesailor31
    A very well designed app for celestial navigation. Ready to dust off the 'ol sextant and put it to work.
  • Great app!

    By Sailorjerry13
    Just purchased this app to augment my rudimentary celnav skills. Great way to check hand calcs and plotting of fixes. Also comes with support for those that may be totally celnav illiterate. Will update after I get more exposure to app.
  • Great companion for learning celestial nav

    By Inglenoir
    I came to enjoy celestial navigation a few years back. While i've only done coastal sailing, as an engineer and astronomer y am fascinated by the technique. This app is a valuable tool for anyone studying this subject, as it is simple and well thought, and will help cross check your hand calculations while you're learning until you are comfortable you know the process of sight reduction and fixing your position.
  • Good Program but Hard to Learn

    By Brian Stipak
    This program offers great capabilities for supporting celestial navigation, but it is somewhat hard to learn to use. In my first hour of trying to use this application, without reading any documentation, I could not succeed in entering two sights I wanted to reduce, and no ways that seemed intuitive to me actually worked. In contrast, when I first tried to use the USSPS Celestial Tools PC program I was able to enter sights right away, reduce the sights, and get a fix. Because I felt that an iPhone app should not be so hard to use, I wrote a caustic negative review. The EZ Sights support personnel wrote me a very helpful email in response to my review, and gave me some help on what I needed to do to enter sights. I have now used EZ Sights to enter sights, reduce sights, and compute fixes. The program does what I want, and I am now happy with its capabilities. It even has the capability to estimate longitude and get a fix from meridian transit observations alone (Use the "Best Fit Method"). In short, I now view this application as having excellent capabilities, but a somewhat hard to learn interface. Expect to need to study documentation (not built into the program) before you can even enter a sight and reduce it. If you are as old with computers as I am, it's reminiscent of learning the idiosyncratic interface of an old, but excellent, DOS program. Once you learn how to use it, it is a good program, and offers good capabilities, especially for the price. I intend to communicate privately with the EZ Sights personnel to offer some suggestions, so that this otherwise excellent program will become more intuitive to use in the future. Brian Stipak, Portland Oregon, S/V Ubiquity
  • Will use while in the Coast Guard for fun

    By lostabroad
    I've always wanted to learn how to use a sextant and now that I have enlisted in the USCG I thought it was time I learned. After fumbling around with calculations and never quite getting the concept I found ezsights and quickly began taking sights around my small town with use of an artificial horizon. It takes a few minutes to learn the UI but once I did getting a sight was extremely simple. I would definitely recommend ezsights to anyone want to learn how to use a sextant.
  • ezSights

    By Rufus31
    This is a fun way to do serious stuff. I am a beginner and I really like this app.