No, unless you want to use HERE WeGo without an internet connection. In that case, you'll need to download a map of the country or region where you are or will be using the app.
To conserve your mobile data allowance or avoid roaming charges when abroad, open the main menu and switch the app offline by ticking the box next to Use app offline. Use downloaded country or area maps on your device to search, get public transport directions and turn-by-turn navigation in that country or area - no internet connection needed.
To download a map, open the main menu and select Download maps.