I used to have a Nuvi 1350 a number of years ago. I have to say, it was not one of Garmin's best models.

But it may be usable, depending on what you expect. The Nuvi was really designed to just use Garmin's City Navigator map, although other maps will work. Generally, they don't look very good on the Nuvi, some features will not show, and IIRC the Nuvi 1350 often didn't show labels on third party maps, like points of interest and road names. You will just have to try some maps and see what you think.
Many of the trail maps on this site are transparent overlays, meaning that they only contain trails and nothing else. They are intended to be used along with another detailed map. You could try them with the built-in City Navigator map. Just enable the trail map along with City Navigator and see what happens. Some of the Nuvi's don't seem to work properly with transparent overlays however.
I don't know anything about Polaris or the areas where you ride so I can't help there. But you could try "MyTrails" which is a popular transparent trail overlay. Download here:
https://www.gpsfiledepot.com/maps/view/53This tutorial explains installing the map in Garmin Basecamp. You may not see much when you install the map in Basecamp, since it only contains trails and therefore will have many areas that are completely blank.
https://www.gpsfiledepot.com/tutorials/how-to-open-maps-in-garmin-basecamp/This tutorial explains how to send the map to your GPS
https://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/And this shows how to select/enable the map on the GPS. The section on the Nuvi is very old and your menus will be somewhat different. I can't remember… the 1350 might have a "MyMaps" menu where you select the map.
https://www.gpsfiledepot.com/tutorials/how-to-change-which-map-is-displayed-on-a-garmin-gps/#nuviIf MyTrails doesn't look useful, try downloading and installing some of the other maps here. Unless the map is specifically listed as a transparent overlay, then you should disable the City Navigator map on the Nuvi and only enable the map that you downloaded.