GPS Altitude mismatch

acvdmolen

Hello, I am living in the netherlands wich is allmost at sea level, but GPS gives altitude between 61 and 80 meters above sea level. Has it to do with configuration issieus (location settings or something like that)? if so, where can i find these because i can't.

Regards,
Arjen

PatrykWaw

acvdmolen Altitude is taken from GPS data, install any GPS info APK a look what values are in

acvdmolen

PatrykWaw if i look in the gps icon on the statusbar in my case i see the right coordinates but wrong azimuth/altitude.

Regards, Arjen

PatrykWaw

"...Generally, Altitude error is specified to be 1.5 x Horizontal error specification. This means that the user of standard consumer GPS receivers should consider +/-23meters (75ft) with a DOP of 1 for 95% confidence. ..."

Source: gpsinformation.net

acvdmolen

PatrykWaw i can follow that but in my case it is 61 to 85 meters which is to much.

ciubaka

acvdmolen you should consider that car head unit isn't a professional measurement device. It's only for the reference. Why do you worry so much about this sea level error?

PatrykWaw

acvdmolen Be aware that in europe, due to the war, there is periodic gps interference.
You can check it here

acvdmolen

ciubaka because i work in the mountains in Europe and then it is very important. On my other HeadUnit i had it was accurate so thats why the question.

PatrykWaw

acvdmolen if its important to you consider using professional measurements device with a pressure calibration. When you use android HU even the location of the antenna is important. Are you using an antenna from the DUDU kit or some other? Cheap antennas, as well as factory car antennas are often produced only for one frequency, for example, only GPS. And there are several navigation systems available in Europe: GPS, GLONASS, Galileo, Beidou

ciubaka

PatrykWaw couldnt agree more

acvdmolen

PatrykWaw Gps test APk says 13 meterwhere dudu7 says 61.3 meters thats a great diffence !

PatrykWaw

acvdmolen in my location exactly the same values