For several years I've been using Microsoft MapPoint for creating the GPS coordinates for the towns I routinely drive through (to and from work, etc.) within CT. I've become accustom to the circles not having exacted measurements with the half a mile increment/spacing. With the size/shape of the towns their is some overlap, but if it lies with in a neighborhood street and not the main route I travel, it usually doesn't matter. I have most of the state covered. I have at least one conventional and one to two trunk systems unlocking and locking each time I cross a town boarder. Generally it's the CLMRN trunk and a conventional system. The idea is I only want to monitor the police and utilities for the town I'm currently in. Fire and EMS frequencies/talk groups tend to repeat per system approximately a neighboring town's distance away. I know at some point I want to revamp the CLMRN trunk system coordinates to cover a much larger area to avoid turning on/off the same towers, it's a work in progress. All that said, it works quite well. Especially since I monitor the scanner from a portable away from the car (not going to get into that creation) and if I can park some where and grab my portable and continuing monitoring, I'm golden. Again, I was just hoping for quicker switching of systems per boarders with a faster GPS, but I can definitely live with the way it is now.