Precise navigation meets global communication with the GPSMAP 66i. This button operated GPS uses inReach technology allowing interactive SOS triggering, two-way messaging, and location tracking via the 100% global Iridium satellite network. Pre-loaded with TopoActive Europe mapping. It includes altimeter, barometer, and compass sensors to help you monitor your ascent & descent, weather changes, as well as improving navigation. It includes access to the Garmin Explore mobile app to review and sync data, including waypoints, routes and tracks. You can also import GPX route files created from other mapping applications, such as OS maps. Compatible with the Garmin TOPO digital topographic maps collection.