To use Google Maps in Ionic, you'll need to follow these steps:

1. Add the Google Maps plugin to your Ionic project by adding the following line to your app.module.ts file:

```typescript import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { GoogleMapsModule } from '@ionic-native/google-maps'; import { IonicModule } from '@ionic-native/http'; import { AppComponent } from './app.component'; import { GoogleMapComponent } from './google-map/google-map.component';

@NgModule({ declarations: [ AppComponent, GoogleMapComponent ], imports: [ BrowserModule, IonicModule.forRoot(), GoogleMapsModule ], providers: [], bootstrap: [AppComponent] }) export class AppModule { } ```

1. In your google-map.component.ts file, import the GoogleMap module and create a reference to it:

```typescript import { Component } from '@angular/core'; import { GoogleMap } from '@ionic-native/google-maps';

@Component({ selector: 'app-google-map', templateUrl: './google-map.component.html', styleUrls: ['./google-map.component.css'] }) export class GoogleMapComponent { map: GoogleMap;

constructor(private mapService: GoogleMapService) { this.map = this.mapService.get mapOptions(); } } ```

1. In your google-map.component.html file, you can add the following code to display the Google Maps marker:

html <google-map options="mapOptions" [center]="mapCenter" [zoom]="mapZoom"> <google-map-marker *ngFor="let marker of markers" (click)="onMarkerClick(marker)"> {{ marker.text }} </google-map-marker> </google-map>

1. In your google-map.service.ts file, create a method that will be called when the marker is clicked:

```typescript import { Injectable } from '@angular/core'; import { Observable } from 'rxjs'; import { map } from 'rxjs/operators';

@Injectable({ providedIn: 'root' }) export class GoogleMapService { private mapOptions: any;

constructor() { this.mapOptions = { center: { lat: 37.7749, lng: -122.4194 }, zoom: 8 }; }

get mapOptions(): any { return this.mapOptions; }

set mapOptions(value: any) { this.mapOptions = value; }

onMarkerClick(marker: any) { console.log(Marker clicked at ${marker.lat}, ${marker.lng}); } } ```

1. In your app.module.ts file, import the GoogleMapService and register it as a provider:

```typescript import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { GoogleMapsModule } from '@ionic-native/google-maps'; import { IonicModule } from '@ionic-native/http'; import { AppComponent } from './app.component'; import { GoogleMapService } from './google-map.service'; import { GoogleMapComponent } from './google-map/google-map.component';

@NgModule({ declarations: [ AppComponent, GoogleMapComponent ], imports: [ BrowserModule, IonicModule.forRoot(), GoogleMapsModule ], providers: [GoogleMapService], bootstrap: [AppComponent] }) export class AppModule { } ```

1. Start your Ionic project and navigate to the google-map page. You should now see the Google Maps marker on the map.

That's it! You've successfully used Google Maps in your Ionic project.