Free map images can be downloaded from these sites.
Note: For unregistered users: You will need to use the Trial version to use these maps, the unregistered Shareware Demo version cannot be used with these images. (The Trial version is included in the OziExplorer Software download.) These maps will require calibrating within OziExplorer using the Load and Calibrate option. (This is described in the Tutorial which can be accessed from the OziExplorer Help Menu).
A Catalogue of sources of map images for all States of the USA.
Nautical Charts - NOAA Raster Navigational Charts (NOAA RNCs™) are distributed here. These RNC charts are raster images which can be imported into OziExplorer using the Import Maps / BSB Chart option. (These are not ENC charts but appear to cover the same regions.)
USDA Geospatial Data Gateway
The Geospatial Data Gateway or Geo-Data Gateway provides access to natural resource data. You can search for available data by geographic area such as county or state, use the point and click map tool to find your area of interest; using a gazetteer, or by entering latitude and longitude coordinates. (Note: See the FAQ on the Data Gateway website if the map does not show in your browser)
http://datagateway.nrcs.usda.gov/
Click on the "Get Data" link on the top of the Geospatial Data gateway page to show the USA map to locate an area.
GeoCommunity
Maps in TIFF format 1:24K, 1:100K and 1:250K. Not all downloads are free. Maps can be purchased on CD for only a few dollars.
University of Texas Library Online
Free maps and listing of other maps available.
Other Links
Doyle's Links Page (Links to map sites)
Custom High Resolution Lake Mapping ; 3D Lake Terrain Imaging
TopoFactory - Create custom topographic maps
GPS Trails - Alaskan USGS maps on CD and Alaskan GPS trail data
Metabien Software - USA Topo maps on CD-ROM
Rocky Mountain DRG Group - New Mexico, Colorado, Wyoming and Montana.
Peter Berbee's Maps, GPS Data and Utility Programs - Data and maps for the Boundary Waters Canoe Area (BWCAW), Dane County Wisconsin, and parts of the UP of Michigan. Utility programs for reducing the number of points in GPS track log and waypoint files. The utilities work with OziExplorer format files.