How can I get the GPS coordinates of a given location?

That worked.
Thank you very much

Latitude and Longitude of a point. Enter an address, or click on a map location.

I need these data in order to insert them in an external device (Garmin GPS Automotive).

It is a bit involved, but you can extract the GPS by sharing your location. Drop the pin on the location on the map you want, then press the "Share" button with the curved arrow and share the location to your Contacts.

In the Contacts.app search for "Dropped Pin". The card will show a URL. The GPS is part of the URL:

Click the URL. The GPS will show in the search field of the map and you can copy and paste it from there:

Probably there is an easier way, but I have yet to discover it.

😁

Added: If you need the GPS frequently, it might be easier for the time being to extract them from Google maps on your Mac: https://maps.google.de

Ctrl-Click on any location on a Google map, use the command "What is here" from the contextual menu, and the gps will show in the search field.

You may wish to send feedback to Apple with a feature request. It is absurd, to have to use complicated work-arounds for the most basic task, to get the precise position of a location. You cannot even measure it on the map, because there is no longitude-latitude grid.

http://www.apple.com/feedback/macosx.html

The easiest ways to get coordinates on the google maps apps:

http://www.motophil.ch/20170216/get-coordinates-from-google-maps-app-on-ios/

Maybe this works for apple maps too?