The R/V PORTUNUS II is a 17-foot-long Boston Whaler that is commonly used to support the R/V Kathryn M. or R/V Poco Loco and as the primary vessel in the nearshore bays, estuaries, and harbors for water quality sampling and diver support. It is fast, stable, and the ideal vessel for the transport of samples to shore or as a shuttle for personnel.
| Power | 90 hp direct injection Nissan outboard |
| Fuel | 24 gallon gasoline |
| Cruise Speed | 26 to 34 kts - depending on deck load |
| Electrical | Two, 120 ampere hour batteries; two, hard-wired power outlets for equipment |
| Electronics | Raymarine Ray 53 DSC VHF marine radio; Raymarine L265 sounder; handheld Garmin map 76 DGPS |
| Deck Equipment | Stainless steel davit and 12 VDC electric windlass; 12 VDC wash down pump |
| Auxiliary Equipment | A variety of oceanographic equipment and biological sampling devices are available for rental through MBC including a Sea-Bird water quality profiler, Van Veen grabs, Phleger corers, otter trawl nets, beam trawl nets, bongo nets, etc. |