use geoloc

app.component.ts

import { Platform } from 'ionic-angular';
import { Geolocation } from '@ionic-native/geolocation';

.
.
.

export class MyApp {
  rootPage:any = HomePage;

  constructor(platform: Platform, geolocation: Geolocation) {
    platform.ready().then(() => {
      geolocation.getCurrentPosition().then((location) => {
      
        console.log(location);
        
      }).catch((error) => {
      
        console.log('Error getting location', error);
        
      });
    });
  }
}