V1 Radar Settings?

I've had my V1 for several months now, but I've never messed with settings. I've searched, and I found that there is an All bogey modes, advanced logic, and logic. What is the differences between them, and what should I use for daily driving on country roads? Right now my screen displays L, which mode is that? Mine always picks up the cop, just not like what I hear (people picking signals 2-3 miles away). I understand terrain has a big impact, but I'm trying to get all I can from it. And finally, how do you change modes? Thanks for any input.

Yep that's got it, thanks! I've been in Advance Logic mode. I'm gonna switch to All Bogey's (most of my driving is open country roads) and hopefully it will pick up a little sooner.

Is there a master reset for the V1? I got mine used, so the previous owner could have changed the settings which is why mine's not picking up in the area as well as what I hear from other users. Thanks a lot!