These maps should be placed on a microSD card, so make sure that the receiver you buy accepts these cards. The GPSmap 64s accepts them, but the base model GPSmap 64 does not.
If you determine you have a Garmin model that accepts a microSD card, check out GPSFileDepot.com for a wide variety of free topos and trail maps. There are great tutorials on the site as well - they show you how to load maps onto your GPS. I look at the tutorials every time I load maps, as I don't do it enough that I feel comfortable doing it without the quick reminder. GPSFileDepot also makes recommendations on the best maps for the area you need to cover.
My buddies and I have been using Delorme two way satellite communicator for some time now and yes, it's very reliable and will keep you in touch with the outside world. It's also very affordable than most satellite gadget I know and for that, this is an excellent buy for many. In the back country, you can't rely on your smartphone to do survival tasks for you. So, invest in a good brand and don't scrimp on quality gear. After all, your life depends on it. For more useful reviews, see this reliable site: http://backpackingmastery.com/top-picks/eight-best-handheld-gps.html
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