It's not necessary to put each county in it's own system, but the memory structure of the 325P2 is not really conducive to trying to load the entire statewide system. You have a limit of 20 groups per system, but only 10 group quick keys to toggle them on or off. So, you'd have to share quick keys, or forego them on a number of departments. There is also a limit, I believe, of 500 talkgroups per system, which would be exceeded if trying to put all the talkgroups into the same system.
Jim's noted the five sites in your home county. I would program those, along with the related Lyon County talkgroups, into one system. The database has all of the talkgroups for your county (county & individual cities & towns) as one department.
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You can either leave those as-is, or split them up into groups-County Law (the Sheriff's Dept). County Fire, plus individual for the various fire departments.
I would also program your immediately adjacent counties, if you can receive them, either as individual systems, or a collective system with all of their sites & departments. For the rest of the state, program a multi-county system (like 4 to 5 counties in each) for other quadrants of the state you occasionally travel to or through.
If, during programming, you make sure to include location data for the other areas, then using a GPS while driving to or through their areas would toggle systems on and off as they come into, or pass out of, range.
You don't show to be a Premium subscriber, which makes makes programming larger systems much easier & quicker by importing them into software. However,
FreeSCAN does have EZ-Grab, which can be used to copy data from the database here on RadioReference into the software. FreeSCAN is free to use, and there is a
user guide in the Wiki. While this does not affect your statewide system, if, at some point, you add the DMR or NXDN upgrade, FreeSCAN does not correctly handle DMR, and has zero support for NXDN. If you need to later add either of those modes, you would need either program manually through the keypad, or purchase
ProScan or
ARC-XT.