The Monitor window provides a tabular presentation of the satellite data received from gpsd. It omits a lot of the finer detail that is available, but you can view this in a Terminal session by running the cgps utility.
Choose Metric or Imperial or Nautical measurements.
Use the Monitor host button to start monitoring a remote host. You will be able to choose the host and/or port that the remote host is using. By default gpsd uses port 2947
If you clear the fields, GPSDConfig will revert to monitoring your local machine at the network address localhost:2947
Clicking the Apple Maps icon will open Maps at your current location. You could also just look out the window.
The table shows they key data associated with each of the satellites.
The column headings are documented in Table 3 Satellites at gpsd_json.
You can sort the table via any column. The previously selected column will be used as a secondary sort. The above sample is sorted by Use and then by SNR in decreasing order.
If you click a column heading a second time the sort order will be reversed.