Project11 is a ROS based open-source framework for surface marine robots specializing in seafloor mapping. The operator’s interface is used to quickly specify, modify and send missions to a robot while a robust bridge helps manage data flow over unreliable network links. A plugin enabled navigation stack allows the development and testing of planners and controllers designed for mapping tasks. Contributions to the community include features from Project11 being adapted by commercial partners as well as the development of open source drivers for sensors.