I found this link for free Garmin compatible maps from OpenStreetMaps today: http://garmin.openstreetmap.nl/.
Could help get around the map advantage the Android phones using OSM have...
It may be worth going to an outdoor shop and playing with something like the Montana.
I have the previous version of the 78 (76CSx) and find some major limitations for automotive use.
Admittedly its about $150 more at Amazon.
The two big advantages are the glove compatible touch screen, which makes searching and any other data entry so much faster and the much bigger screen.
The screen also auto rotates, so you can use it in landscape or portrait modes.
That's more useful than you think: usually I use it in portrait mode so as to get a better idea of the route ahead, but sometimes there are a bunch of side roads that I need to select from. In that case I flip the unit to get a better view to either side.
Not that useful when the map is routeable, but in the 3rd world, many maps I've tried are not, and also don't have street names.
A big screen is also good for my old eyes that aren't what they were, you may not have that problem...
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