Hi, I'm new to this and already have a Garmin Instinct watch that does all the data measuring I need. I bought a 2nd hand 820 as all I want is to display live maps of where I am; not as part of a defined route or anything like that. I just want it to do what my car satnav does which is show me where I am and what's around me so i can explore. any help would be appreciated.