that is mainly why i went with the inland that is the two places i fish and i don't go offshore. the difference in the different garmin models are processor speeds but also as you step up you get different maps for example 421- base map 431- inland 441 coastal. the way i was explain it you can buy the coastal chip in case you go offshore. also the 4xx,5xx,6xx so on is the screen size i believe. 4xx is the four inch and so on. the guy at west marine was very helpful
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