start external map navigation from ionic 2 app for ios and android; needs cordova-plugin-geolocation

location.ts

startExternalMap() {
  if (this.location.latitude) {
    this.platform.ready().then(() => {
      Geolocation.getCurrentPosition().then((position) => {
        // ios
        if (this.platform.is('ios')) {
          window.open('maps://?q=' + this.location.name + '&saddr=' + position.coords.latitude + ',' + position.coords.longitude + '&daddr=' + this.location.latitude + ',' + this.location.longitude, '_system');
        };
        // android
        if (this.platform.is('android')) {
          window.open('geo://' + position.coords.latitude + ',' + position.coords.longitude + '?q=' + this.location.latitude + ',' + this.location.longitude + '(' + this.location.name + ')', '_system');
        };
      });
    });
  };
}

updated syntax for ios 11+ ionic 3

window.open('maps://?q=' + address, '_system');

import { InAppBrowser } from '@ionic-native/in-app-browser/ngx';

constructor(public iab:InAppBrowser)

OpenMap(address) {
this.iab.create("https://maps.google.com/maps?q=" + address, "_blank");
}