index.android.js

import React, { Component } from 'react';
import { AppRegistry, Text, View } from 'react-native';

const options = {
  enableHighAccuracy: true,
  timeout: 10000,
  maximumAge: 1000
};

const myPosition = () => {
  navigator.geolocation.getCurrentPosition(
      position => console.log(JSON.stringify(position)),
      error => console.log('Erro: ', error)),
      options
};

export default class navigator_test extends Component {
  render() {
    myPosition()
    return (
      <View>
        <Text>Navigator test</Text>
      </View>
    );
  }
}

AppRegistry.registerComponent('navigator_test', () => navigator_test);