Here’s a deep review of , focusing on what it is, its strengths, limitations, and how it compares to other topographic map sources. 1. What is MyOpenTopo? MyOpenTopo is a free, web-based platform that provides customizable, high-resolution topographic maps primarily for the United States. It generates maps using public domain data (USGS, NASA, state GIS sources) and allows users to download them as PDF or GeoPDF files with optional UTM grid overlays, elevation profiles, and waypoints.