Garmin GPSMAP 76CSx

Summary: This device is inspirational in its design and functionality. This is the third GPS device I have owned in addition to using several I have not owned. It provides rapid and accurate readings around the world (have used it from equator to north of arctic circle and in China, US, and Europe, but not everywhere). It includes a great receiver design, is fairly energy efficient (unlike some of the previous Garmin models). It includes an accurate altimeter (can meausre the height of room within a foot or two), an electronic compass, a functional mapa interface, and normal customizable interfaces for trip statistics. It provides navigation information, including pop-up maps, based on downloadable maps. It provides no voice prompting but does do rerouting and has tonal prompting.
My only substantive complaint is the cost of the maps (topo, street/city, etc.) that can be downloaded. I have noted on the internet claims of much cheaper compatible maps but have no experience using them. I also find the users manual minimally useful, possibly because I am an engineer and want to understand in far more detail than is provided how some of the functions work (how do you calibrate a compass by turning a device twice in a circle, for exmaple).