A towable and steerable elongated float for a marine seismic source arrangement for use in making a seismic survey at sea, having first attachment means at a lower or bottom part of a float body for allowing at least one seismic source to be suspended from the float, and second attachment means on a fore part of the float body for attachment of a strength taking source towing line or umbilical. The first retention member is selectively oriented in one of a first position and a second position. The data manager includes a subscription list for the plurality of clients for providing the clients with data updates. During one or more stand-by phases, the control device is switched with essentially no current between the first operational phase and a second operational phase. The inner pin is engageable with a key inserted into the key slot, and further engageable with the outer pin.