If you have a iPhone you can use an app, GPS2IP, and connect it to GPS NMEA on the RPI4 via wifi. Then you don't need a GPS dongle. Just a thought..Works great on my set up.
Erland

Thank you so much for that tip, Docerland!

Thanks for your input. I don't have an Iphone, so I have to think about a usb hub since all the ports are already full
Later edit: for those using android I used the app NetGps and works

So you mean that for rtc you use gps data and your astroberry is synchronized?

Yes. It's a must when you are in the field with no internet connection to the raspberry.

IT's the same when you use a smartphone/tablet like a gps?

Yes. You can also enter manually all the data in the Site Management (mount options). But it's easier and fast using the gps.

If I can use fewer devices attached to the raspberry it is better, if I can only use the smartphone for the rtc and gps function it would make it less complicated to manage

Could you hint on how to connect/configure.
I installed NetGPS, enabled the server, it gave me an IP address.
Now, how to connect and where to stick the address?
I am a bit lost...
Thanks!

1. First, connect your phone to the astroberry hotspot.
2. Assign a static ip for the phone (every time you connect to hotspot you may have a different ip)
3. Start Kstars and ekos. In the drivers aux tab chose GPS Nmea. Click save.
4. Start NetGPS Server. Create a server with the + sign and enable it. Pay attention to the port number. This one has to match with the port from ekos. I set mine to 50000
5. Start ekos. Go to GPS Nmea tab in the indi driver., choose connection and in the server option put the the static ip of the the phone an the port number and click set. Mine is 10.42.0.45 port 50000. Now go to options and click save to save the configuration.

The phone acts as a server. The indi driver is comunicating via IP with the phone. You need to point the indi driver to the phone, in the GPS Nmea options. The save the configuration.

Adding to that, using GPS on your phone may quickly drain the battery. In principles only a first update from the phone to KStars is needed. The internal clock of the pi is stable enough to not drift too much over one night. Plus your telescope will not travel so once the location and time are known you can stop the app on the phone. GPS Nmae will complain (and therefore so will Ekos) but you may ignore that.


Wouter

Great - thank you very much!