@Lluis-Arasanz said:
Not sure if I'm writing anything correct or not... but I suppose altitude comes from GPS. Perhaps it takes GPS position from Carplay device and this is not providing it? (rare, I know, but ...)
From https://support.chigee.com/portal/en/kb/articles/how-the-chigee-display-works#How_to_Navigate_Without_Cellular_Data_Offline_Maps
'Note: While using CarPlay or Android Auto, the navigation position (GPS signal) is provided by your phone's GPS receiver, not the Chigee device.'
Interestingly, it does have on-board GPS, but it's only used 'exclusively for system data and dashboard metrics', such as:
Time & Date: Automatically calibrating the time zone and ensuring accurate time display.
Speedometer: Displaying real-time speed on the dashboard interface.
Odometer: Tracking travel distance for trip recordings.
So it has some basic GPS-related features without the phone.