# Variation

> Variação para o dia atual. Utilizado em navegação com bússola magnética.

Canonical page: [https://chrome-stats.com/d/com.Variation?hl=pt](https://chrome-stats.com/d/com.Variation?hl=pt)

## Overview

- **ID:** `com.Variation`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Navigational Algorithms
- **Category:** MAPS\_AND\_NAVIGATION
- **Downloads:** 25,402
- **Rating:** 5.00 / 5 (113 ratings)
- **Version:** 5.1
- **Last updated:** 2025-07-02
- **First published:** 2014-09-09
- **Publisher country:** ES
- **Size:** 6.52 MB
- **Data as of:** 2026-09-12
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.Variation)
- **Website:** [http://sites.google.com/site/navigationalalgorithms/](http://sites.google.com/site/navigationalalgorithms/)
- **Privacy policy:** [https://sites.google.com/site/navigationalalgorithms/software/android](https://sites.google.com/site/navigationalalgorithms/software/android)

## Description

VARIAÇÃO para o dia atual.<br>Utilizado em navegação com bússola magnética.<br>-<br>Variação é o ângulo entre os meridianos magnéticos e geográficos em qualquer lugar, expresso em graus leste ou oeste para indicar a direção do norte magnético a partir do norte verdadeiro. Chamada de VARIAÇÃO MAGNÉTICA quando é necessária uma distinção para evitar possíveis ambiguidades. Também chamada de DECLINAÇÃO MAGNÉTICA. (Bowditch)<br><br>O aplicativo usa o modelo magnético mundial: WMM2025.<br>O novo modelo é válido de 13/11/2024 a 31/12/2029.<br>Veja: https://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml<br><br>Sua última posição é salva automaticamente. <br>   - É necessária permissão de armazenamento para salvar sua posição.<br><br>CALCULADORA DE CURSOS<br>Bússola e curso verdadeiro.<br>COEFICIENTES DE DESVIO<br>Dev = A + B SIN(Ra) + C COS(Ra) + D SIN(2Ra) + E COS(2Ra)<br>Calcule os coeficientes A,B,C,D,E com o aplicativo Windows &quot;Bússola Magnética&quot;, (disponível no site Algoritmos de Navegação).<br>Insira-os e salve. O aplicativo lerá os dados e a calculadora do curso poderá calcular o desvio.<br>               <br><br>INTERACE COM O USUÁRIO<br>- Botões de zoom +/-<br>- Tipos de mapas: normal, terreno e satélite<br>- Localização GPS. (A permissão do aplicativo &quot;Localização&quot; deve ser permitida. Ligue seu GPS e a detecção automática de localização será possível)<br> <br>Eventos no mapa:<br> • Clique Longo: adiciona uma marca com a variação da posição do dia atual.<br> • Toque na marca para ver as informações.<br> • Gestos de mapa: https://developers.google.com/maps/documentation/android-sdk/controls

## Rankings

- #394,991 — Overall
- #1 — variation

## Permissions and access

### Permissions

- `android.permission.ACCESS_COARSE_LOCATION`
- `android.permission.ACCESS_FINE_LOCATION`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.INTERNET`
- `android.permission.READ_EXTERNAL_STORAGE`
- `android.permission.WRITE_EXTERNAL_STORAGE`
- `com.Variation.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `com.google.android.providers.gsf.permission.READ_GSERVICES`

## Review summary

Users appreciate the app's accuracy and usefulness in finding magnetic variation and declination. However, many report significant issues with the GPS/location detection feature not working correctly across various devices, forcing users to manually select their location. Additionally, the app sometimes defaults to a location in Spain instead of the user's current location. Some users also experience crashes on older Android versions. Overall, while helpful, the app's location functionality needs improvement.

### Pros

- Accurately provides variation data and is consistent.
- Helpful for finding magnetic declination.
- Good application when location permission is granted.

### Cons

- GPS/location detection does not work properly on multiple devices.
- App defaults to location in Spain instead of user's actual location.
- Crashes instantly on some older Android versions (e.g., Android 4.04).
- Requires manual location selection if GPS is not functional, reducing convenience.

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.Variation?hl=pt)