TCarta has made available a free version of the Global Marine Basemap for use in the Global Mapper software. The Global Marine Basemap is derived from the best available bathymetry data to provide end-users an engaging backdrop with more robust information than any other publicly available marine basemap. 

This resource provides:

• A view of maritime operations
• Context for projects 
• Situational awareness
• Overlay data
• A backdrop for printed maps

Learn more here.