# Compass Altimeter: Sun & Moon

> Outdoor GPS altimeter: height, compass, barometer, golden & blue hour, sun, moon

Canonical page: [https://chrome-stats.com/d/com.knockdream.compass](https://chrome-stats.com/d/com.knockdream.compass)

## Overview

- **ID:** `com.knockdream.compass`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** KnockDream Technology
- **Category:** MAPS\_AND\_NAVIGATION
- **Downloads:** 28,967
- **Rating:** 4.38 / 5 (138 ratings)
- **Version:** 1.5.1
- **Last updated:** 2026-07-28
- **First published:** 2025-09-20
- **Publisher country:** CN
- **Size:** 39 MB
- **Data as of:** 2026-09-10
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.knockdream.compass)
- **Website:** [https://lightpollutionmap.app/](https://lightpollutionmap.app/)
- **Privacy policy:** [https://laysky.com/compass-privacypolicy.html](https://laysky.com/compass-privacypolicy.html)

## Description

Compass Altimeter is a clean, pro‑grade altitude and compass tool that fuses GPS with (iOS) barometer/absolute altitude for faster, more accurate live readings—ideal for hiking, exploration, landscape photography, and stargazing.<br><br>Key Features<br>• Live altitude: GPS + barometric fusion with accuracy readout<br>• Relative altitude: set a base point to track ascent/descent<br>• Compass: True/Magnetic North, localized direction text (NESW), subtle haptics<br>• Calibration &amp; interference: magnetic interference detection with calibration tips<br>• Sun &amp; Moon: elevation/azimuth, sunrise/sunset and moonrise/moonset<br>• Photography aide: golden/blue hour with bearings for better framing<br>• Coordinates: switch between Decimal and DMS; one‑tap copy<br>• Sources &amp; accuracy: Auto/GPS/Barometric modes; GPS High/Medium/Low accuracy<br>• Pressure: live pressure with units (hPa/mmHg/inHg/psi)<br>• Personalization: m/ft, 12/24‑hour, language, precision display, splash animation<br><br>Design &amp; Performance<br>• Large, legible typography with modern UI<br>• “Fast‑then‑precise” positioning and smart lifecycle for stability and battery savings<br><br>Use Cases<br>• Hiking and outdoor exploration<br>• Landscape photography timing (golden/blue hour)<br>• Astronomy and education<br>• Travel logging and altitude lookup<br><br>Privacy &amp; Permissions<br>• Location while in use only; used for altitude and sun/moon calculations (no continuous background tracking)<br>• Motion/Barometer (iOS) improves altitude accuracy<br>• Preferences stored on device; no personal data uploaded<br><br>Disclaimer<br>• Measurements depend on environment/device and are for reference only<br>• Not for aviation, medical, or life‑critical use

## Rankings

- #374,708 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_COARSE_LOCATION`
- `android.permission.ACCESS_FINE_LOCATION`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.CAMERA`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.READ_EXTERNAL_STORAGE`
- `android.permission.RECEIVE_BOOT_COMPLETED`
- `android.permission.RECORD_AUDIO`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `com.android.vending.BILLING`
- `com.android.vending.CHECK_LICENSE`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.google.android.gms.permission.AD_ID`
- `com.knockdream.compass.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `freemme.permission.msa`

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.knockdream.compass)