The Willie Mac II is powered by two Caterpillar 3208 turbo-charged diesel engines.  Access to the engines is through the two large hatches at the aft end of the cabin sole.  There are three fiberglass fuel tanks.  The two side tanks are approximately 450 gallons each, the center tank approximately 200 gallons.  The engine compartment is fitted with an automatic discharge halon "Fireboy" fire extinguisher. Additional firefighting equipment (two 10lb and two 5lb USCG approved type ABC "Kidde" fire extinguishers), is located in the wheelhouse.

There are on board 27 adult and three children's USCG Type 1 PFDs with reflective tape and lights equipped with dated batteries/  The vessel is also equipped with two 15 person float free life raft/rings located at the aft of the flybridge, and 2 throw life rings.  All of the previously mentioned safety gear is manufactured by Jim Buoy.  There is a first aid kit on board, and an oxygen set is taken on when dive operations are being conducted.  The vessel is supplied with a compass, GPS/Charting system and forward searching sonar/depth sounder.  All required horns, bell and USCG approved flares are located in the wheel house.

There are five anchors on board.  Mounted bow rollers are a 66lb Bruce with  100' of 3/8" chain and 200 feet of 3/4" dual braid line, and a 33lb Fortress (Danforth type) with 25 feet of 3/8 chain and 300' of 3/4 dual braid line.  The foredeck is equipped with an Ideal #1 windlass with chain gypsy. For storm mooring the vessel is equipped with a 66lb Claw (Bruce type), and a 77lb Brittany (Danforth type), each equipped with 125" of 3/8" high-test chain. A 25 lb Danforth and 100" of 5/8 three strand anchor line are used for temporary stern anchoring.