There are four AutoNaut sizes, ranging from 2 to 7 metres. With increased length comes greater speed and payload capacity, as well as an increase in the power generation capability for the on board sensors.
Auxiliary electric propulsion or hybrid drive is available for calm conditions and manoeuvring. A fuel cell may be fitted to provide additional power for sensors, although for most missions the Photo Voltaic panels harvesting solar energy on the deck will be sufficient.
The illustrative specifications for a 2m, 3m, 5m and 7m AutoNaut can be viewed and downloaded here