MapSherpa's USA Topo - Modern custom map product now includes updated quads through September 30, 2023.
The USGS update schedule is available here. MapSherpa checks for updates quarterly in January, April, July and October.
Each United States Geological Service US Topo map covers 7.5 minutes of latitude by 7.5 minutes of longitude. at a scale of 1;24,000. Our custom map is built by rasterizing the source PDFs at 300 DPI and creating a mosaic of the map sheets for a complete coverage of the USA.
