The Connectivity to APRS enables Radio Mobile to extract network data from the APRS network in a more sofisticated way. It is just a feature added to Radio Mobile.
It is beyond the scope of this website to describe in to detail the various topcis involved in APRS as they are mentioned. Due to the various effects that different routing mechanisms in APRS have on Radio Mobile it is suggested to study APRS before you go on with APRS in Radio Mobile.
Information on APRS can be found all over the internet in different quality's.
One recommended source of information is the website of DIGI_NED.
On this site detail information can be found on routing mechanisms in APRS.