When you are fishing the engine stays off for most of the time, and the boat moves as the sea pleases. At rest, stability comes first of all from the beam: the NAVY 4.80 is 1.82 metres wide, the NAVY 5.50 2.35, the NAVY 6.00 2.50, the NAVY 7.60 2.89 and the NAVY 9.50 Cabin 3.20. Anyone who fishes standing up, with someone beside them, feels the difference from one size to the next.
The tubes, which run along the whole gunwale, do the rest. Their diameter grows with the size: 48 cm on the 4.80, 50 on the 5.50, 52 on the 6.00 and the 7.60. From the 4.80 to the 7.60 they are in ORCA Hypalon-neoprene by Pennel & Flipo, 1.3 mm thick, and those of the 9.50 Cabin are ORCA Hypalon-neoprene too. For an angler the tube is also where you brace your knees when you lean out to net a fish, and the rubbing strake with extra grab handles, on the price list for the 4.80, the 5.50, the 6.00 and the 7.60, gives you one more hold along the side.
Then there is the sea you go out in. The 4.80, the 5.50, the 6.00 and the 7.60 are in design category C: Directive 2013/53/EU defines it for wind up to and including force 6 and significant wave height up to and including 2 metres. The NAVY 9.50 Cabin is in category B, up to force 8 and waves of 4 metres. These are design limits, not an invitation: go fishing only in a sea your experience can handle.