Display Preferences
Units
In this panel, you can choose your preferred display units. These settings will be default to the measurement system that you have chosen in macOS System Preferences.
Where is Temperature?
QTH.app only includes unit preferences where a System Preference does not currently exist.
To specify temperature units, go to System Preferences → Language & Region
Callsign Lookup
In this section, you can select and enter the credentials necessary for querying the supported lookup services. This is used for for creating Contact records.
QRZ
If you are not a QRZ.com subscriber, please keep in mind that QRZ places a limit on the number of lookups that can be performed per day.