Specmar inc (previously specialty marine contractors) is an aluminum boat design, lofting, and kt company. we have a large product line including aluminum drift boats. A rescue lifeboat is a boat rescue craft which is used to attend a vessel in distress, or its survivors, to rescue crew and passengers. it can be hand pulled, sail. The sentinel class frc features a stern ramp for launching short-range prosecutor (srp) rigid-hull inflatable boats..