A system that substantially extends the towing depth of a low-cost side-scan, so it can be towed close to the sea floor to produce fine detail images. It transmits the data over a network that links wireless to a laptop, allowing the laptop to be kept in a dry place. The network setup also allows for additional devices to be connected, e.g. heading and depth sensors cameras and control units. It is based on the low costStarFishseabed imaging system.