Garmin eTrex 30x 010-01508-10 Handheld Navigator UPGRADED DISPLAY - Features a 2.2 65K color sunglight readable display offering increased resolution (240 x 320 pixels). Physical dimensions: 2.1" x 4.0" x 1.3" (5.4 x 10.3 x 3.3 cm) LOAD MORE MAPS - Large 3.7 GB of internal memory and microSD card slot lets you load a variety of maps, including TOPO 24K, HuntView, BlueChart g2, City Navigator NT and BirdsEye Satellite Imagery (subscription required) PRELOADED BASEMAP - Includes a worldwide basemap with shaded relief BUILT-IN SENSORS - eTrex 30x adds a built-in 3-axis tilt-compensated electronic compass and a barometric altimeter which tracks changes in pressure to pinpoint your precise altitude, and you even can use it to plot barometric pressure over time WIRELESS - Wirelessly share your waypoints, tracks, routes and geocaches with other compatible devices -simply press send to transfer your information -also wirelessly connects to compatible Garmin devices, including VIRB and accessory sensors.