Attached is a zip file, which is how we have to attach HPE files. Download and unzip it, the result should be Martin Co MN.hpe. Locate and remember where this HPE is stored on your computer.
Then start Sentinel and go to File>Import from HPE and click New Favorites List Box. Call it Martin County and click OK. Next find that HPE file you downloaded and unzipped. It should then create a Favorites List for you.
You still have a little work to do, because I'm not familiar with that part of the state - I'm lucky to be able to find myself around the south side of Minneapolis (my home town).
You will need to edit the Favorites List/ARMER System and set the Avoid to On for all the sites that are NOT within 30 miles of you (Ada MN for example). Yes, there will be a boatload of them (270 or so), but it is what it is. Do NOT delete them - Avoid them. If you do the delete, you could inadvertently delete one you need and getting it back will be a pain.
Visit the site at
https://dps.mn.gov/divisions/ecn/programs/armer/Pages/current-status.aspx and look for ARMER Sites Map to get a link to a map for all the sites where you can see which are close to you.
I also set the ID Search to On. That casts a little wider net because you may discover some things of interest you didn't recognize as such. If you come across stuff you don't like, use the Avoid button when scanning to lock out the talkgroup. (Press twice rapidly to permanently lock it out).
It has the Martin county talkgroups, MNDOT that I think are in your area, the Interoperability talkgroups (neat stuff on them) and state patrol. The search function may bring in adjacent counties you could find interesting.
I've also included the Martin County conventional "stuff" because I suspect fire and EMS are still on the "old" frequencies (as in not migrated to ARMER). (Cops usually get the good stuff and us fire guys aren't always so lucky).