The Garmin Montana has RS-232 NMEA I/O, a large color touchscreen, and can do on-street routing. Most (but not all) of Garmin's Outdoor models (Montana, Oregon, Rino, GPSMAP 62/64) are NMEA 0183 I/O capable and will interface to a D7/D72/D700/D710 with the appropriate data cable. -Jerome, W0JRT