I use one in Dayton and travel with it too. I don't use the GPS locally. If you know what's in your area and use (have mastered) other scanners you'll eventually set up favorite lists similarly. Traveling wise the GPS is really slick. I never really get a chance to play with it (safe driver here). It seems to work well just traffic after a few clicks. Haven't traveled too much with GPS in Ohio but it seems to work. MARCS Multi-site isn't a strong suite on Unidens IMO. GRE plays nicer from testing. That said... The HP-1 does work on MARCS. Just like any scanner... tons of county systems and conventional freqs coupled with many departments turned on causes missed transmissions. This how I like to travel with it. I haven't locked it down on MARCS and driven 100 miles in Ohio. But I will next time.
How it works... You select the "Service Types" you want to hear. These are broken into categories like Law Dispatch, EMS, Business, Ham... it keeps going and you can make your own now.
You set your range. Up to 30 Miles. It loads much more than 30 on that setting. Shows KY and IN with that setting from Dayton. Location is given to unit by either zip code entry or NMEA stream.
Based on service types and location.... the frequencies, trunked systems, sites and talkgroups are loaded into working memory and is scanned.
Different way of thinking. You don't really care about trunked systems. More about department types/channels and range you want to hear. Realistically, most experienced users like us do care. And it's easy to 'hold' and only scan 1 county system or a MARCS site. Make your scan lists.
Great for driving or visiting a new city. Fun to play with locally by locking all the constant traffic stuff. And just listen to the obscure