Demonstrate the usage of Google Maps on Ionic 2
Ionic is the beautiful, free and open source mobile SDK for developing native and progressive web apps with ease. http://ionicframework.com/
https://developers.google.com/maps/?hl=pt-br 
Para obter uma chave do Google API, acesse a pagina https://developers.google.com/maps/documentation/javascript/get-api-key?hl=pt-br faça seu login e solicite sua chave.
Modifique o arquivo src/index.html (linha 15) e altere YOUR_API_KEY com a chave gerada.
Ionic 2 & 3: How to Use Google Maps & Geolocation 
https://www.joshmorony.com/ionic-2-how-to-use-google-maps-geolocation-video-tutorial/