Mac Garmin Help in GPS technology and devices Posted July 15, 2012 The "wireless" feature of the Dakota 20 is for transferring data from things like heart rate monitors, bike computers, swapping data between other units. You'll still need to plug it into your computer to copy your pocket queries or other GPX files to/from the GPS. "Chain stores" - if you mean physical, brick and mortar locations - vary widely but usually can't compete on price alone. Great way to get some hands-on sense of the equipment though. You'll find several opinions in these forums about which chain stores people like best (REI, Bass Pro, Gander Mountain, etc.) but the focus there will be customer service, opportunity to handle the merchandise before buying, stuff like that.