Sight reduction

Name: Sight reduction
Rating: 3.6666667 (122 reviews)
Author: Navigational Algorithms

By: Navigational Algorithms

Celestial navigation. Take the sextant and get your Line of Position.

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Features & Capabilities

Sight Reduction is a powerful Chrome extension designed for celestial navigation enthusiasts and professionals. It helps users perform sight reduction by calculating the intercept and azimuth using the Marcq Saint Hilaire intercept method, based on observed altitude and Nautical Almanac data.

Key features include input options for observed altitude, calculation of intercept (p=Ho-Hc) and azimuth (Zn), running fixes, and the ability to plot up to three Lines of Position on Google Maps. It provides tools for calculating Local Hour Angle (LHA), a list of navigational stars, and a logbook feature with output copied to clipboard.

Optimized with a user-friendly interface, the extension supports GPS location detection for GNSS fixes, multiple map types (standard, terrain, satellite), and zoom controls. Sight Reduction is essential for sailors and navigators seeking precise astronavigation solutions.

User Growth & Download Statistics

App Navigation & Mapping Education

By:

Navigational Algorithms

Downloads:

32,351 13

Rating:

3.67

(122)

Version:

4.12 Last updated: 2025-04-25

Version code:

Creation date:

2014-07-21

Publisher country:

Permissions:

android.permission.ACCESS_COARSE_LOCATION Very high risk
android.permission.ACCESS_FINE_LOCATION Very high risk
android.permission.FOREGROUND_SERVICE Low risk
android.permission.INTERNET Low risk
com.google.android.providers.gsf.permission.READ_GSERVICES Low risk
android.permission.ACCESS_NETWORK_STATE Safe
com.Sightreduction.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Size:

10.18MB

Email:

na*****@gmail.com

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-06-05

Compare stats and ranking:

Ranking

# 347,235 ▼ 1,215

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

Navigational Algorithms

Google Play Store

https://play.google.com/store/apps/details?id=com.Sightreduction

Email:

na*****@gmail.com

Website:

http://sites.google.com/site/navigationalalgorithms/

User Reviews

Users appreciate the app as a valuable navigation aid that saves time and works well especially with a nautical almanac app. However, multiple reviews mention issues such as absence of time input for sights, data loss when rotating the screen, and difficulties with data entry including negative instrument corrections. Improving the interface and adding time specification would enhance usability.

Pros

Great reference material for sight reduction and navigation calculations.
Saves significant time and effort compared to manual paper methods.
Works well when used in conjunction with a nautical almanac app.
Helpful for quick plotting of fixes and verifying navigational work.
Provides a reliable backup to GPS navigation.

Cons

Lacks time specification for each sight, limiting navigation accuracy.
Data entry interface is cumbersome and could be improved.
App loses previous Line of Position (LOP) data when device orientation changes.
Difficulty entering negative instrument correction values, requiring workarounds.