Accepts custom maps – These units can accept custom raster maps and Garmin BirdsEye imagery.Please note that there are lots of free maps available for these units. Units with pre-loaded detailed maps also offer some internal storage, in addition to SD/microSD. Ability to add maps/storage – If a unit accepts maps, the storage medium or available internal memory is listed.The only “hi-res” units I recommend for fixed mount, non-external power use (e.g., bike handlebars) are the Dakota and Oregon 6xx series. They can also be customized to enhance viewing in bright conditions. Even so, the newer hi-res units are suitable for handheld use, where you will intuitively tilt the screen for the best view. Display type – Monochrome and older high resolution (hi-res) units tend to be more difficult to read in daylight conditions.
