OpenTopoMap

OpenTopoMap is an open-source online map put together by a voluntary team supported by the Friedrich-Alexander University of Erlangen-Nürnberg (FAU) in Germany, which consists of invaluable contour lines based on SRTM (Shuttle RADAR Topography Mission) DEM (Digital Elevation Model) published by NASA and supplemented with regularly updated geographic information by OpenStreetMap (OSM). Refer to the section of maps for GPS below for OpenTopoMap Garmin.

Download: Open a flexible pop-up window map by clicking the top-right icon on the map or earth-like icon () ubiquitously provided in this site; adjust the contents and configuration of the full-width map fit in the window, and right-click on the map to download the snapshot in PNG format.

More serviceable systems to enable download of images in variable sizes regardless of the window width is in progress.

OpenTopoMap layer