If you make stuff in Arc as a shapefile, there's some conversion stuff that gets a little wonky if you make it a .gpx.
The best free tool for you would be MN DNR Garmin that can convert the shapefile and send it to your GPS in a single operation. GPS Babel would probably work, too.
Topfusion is also compatible with shapefiles, though I haven't really used it with them yet to see how it might handle sending one to a GPS.
Ok the MN DNR Garmin program worked pretty well at getting basic info on and off the GPS, but it doesn't appear to allow me to make polygons. I'll have to mess with it a bit more.
Topofusion has a free version so you can try it out.
Yeah, polygons really aren't going to be supported very well. That's less an issue with MN DNR Garmin and more an issue with the GPS. Your best bet if you want polygon data would be to go the custom map route. You can make your own vector maps for your Garmin with whatever data you want. I think gpsfiledepot has a tutorial on how to pull that off.
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