# Compass App by SDPO Alim

> Celestial Azimuth Calculator for Seafarer (Compass Error/Compass Log/Gyro Error)

Canonical page: [https://chrome-stats.com/d/org.ofa.compassapp](https://chrome-stats.com/d/org.ofa.compassapp)

## Overview

- **ID:** `org.ofa.compassapp`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** SDPO Ö.F.Alim
- **Category:** MAPS\_AND\_NAVIGATION
- **Downloads:** 18
- **Version:** 1.0.2
- **Last updated:** 2026-04-22
- **First published:** 2026-04-19
- **Publisher country:** TR
- **Size:** 19 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=org.ofa.compassapp)
- **Privacy policy:** [https://www.freeprivacypolicy.com/live/eedd4152-46cd-42b9-92de-7172a7113bf9](https://www.freeprivacypolicy.com/live/eedd4152-46cd-42b9-92de-7172a7113bf9)

## Description

Release Notes: Compass App by SDPO Alim (Marine CompassApp) v1.0.0<br>Core Navigation Features<br><br>Real-time Gyro Error Calculation: Instantly calculates Gyro Error by comparing True Bearing with Gyro Bearing.<br><br>Automated Magnetic Variation: Integrates the World Magnetic Model (WMM) via the geomag library, automatically calculating precise Magnetic Variation based on the vessel&#39;s real-time GPS coordinates.<br><br>Dynamic Deviation Table: Features an interactive, customizable Deviation Table. The app automatically interpolates the correct deviation value based on the vessel&#39;s current Gyro Heading.<br><br>Comprehensive Compass Conversions: Displays real-time calculations for True Course, Gyro Course, and Compass Course simultaneously.<br><br>Offline Celestial Navigation<br><br>Zero-Internet Dependency: Powered by the skyfield library and de421.bsp ephemeris data, all celestial mechanics and sight reductions are calculated 100% offline.<br><br>Extensive Celestial Database: Supports tracking and calculation for the Sun, Moon (Upper &amp; Lower limbs), Major Planets (Jupiter, Mars, Saturn, Venus), and key navigational stars (Sirius, Canopus, Rigel, Achernar, Hadar, Suha/Alcor).<br><br>Real-time Azimuth &amp; Altitude: Continuously computes the True Bearing (Azimuth) and visibility (Altitude) of the selected celestial body based on UTC and current vessel position.<br><br>Digital Logbook &amp; Observation Data<br><br>Digital Master Log: A built-in, scrollable digital logbook that records timestamped observations, including Lat/Long, Target Object, Bearings, Courses, and Errors.<br><br>Detailed Observation Sheet: Simulates a traditional Nautical Almanac calculation sheet. Allows users to review past records with detailed breakdowns including GHA, Declination, LHA, d-correction, and Total GHA/DEC.<br><br>Local Data Storage: All navigation logs and deviation tables are securely saved locally on the device (JSON/TXT formats).<br><br>User Interface &amp; Experience<br><br>Bridge-Friendly UI: Features a high-contrast layout optimized for readability during critical navigation tasks.<br><br>Day/Night Mode Toggle: One-tap switch between Day and Night modes to preserve night vision on the bridge.<br><br>Automated Hardware Integration: Seamlessly requests and utilizes Android device GPS (Fine/Coarse) and Network location providers for precise positioning.

## Rankings

- #2,619,815 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_COARSE_LOCATION`
- `android.permission.ACCESS_FINE_LOCATION`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `com.android.vending.CHECK_LICENSE`
- `org.ofa.compassapp.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

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Source: [Chrome-Stats](https://chrome-stats.com/d/org.ofa.compassapp)