Wie ist das mit der Wetter Nachricht ist sie einmal im Monat kostenlos oder einmal am Tag?

Google Translate is not doing a good job with the question. 

There are two types of plan.

With an annual plan, the device is active all year. There is one-time activation charge. $29.95 in the US. There is also a monthly charge every month. $11.95/mo for safety plan in the US.

With a Freedom plan, the you can activate/inactivate the device on a monthly basis. There is an annual fee. $34.95 in the US. There is also a monthly charge in the months where the device is active. $14.95/mo for safety plan in the US.

The quotas listed for each plan (for example, included text messages) are monthly.

Your actual costs will depend on the country in which you register the device. An example of costs in Germany can be found here:

https://discover.garmin.com/de-DE/inreach/personal/#subscriptions