Hi, I have several Garmin Nuvi's. Two 2595LMT, a 2598LMTHD and a 2689LMT which I have topo maps on. I got the maps from GPSfile Depot. Installed them on an microSD card with mapinstall. Seems to work. They show up along with the highway and city street maps. I haven't tried the marine charts yet but I did put Garmins Lakes HD100 on the cards also. They show up in the map menu but I haven't had a chance to use them. I have a GPSMap 78sc for that so there hasn't been a need. Jim
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