Computer hardware and software for measuring, monitoring and analyzing the movements of on-board liquids in particular on barges, liquid natural gas tankers, liquefied gas transport ships, or land vehicles; software for measuring the evaporation rate of on-board liquefied gas (boil-off) in particular on barges, liquid natural gas tankers, liquefied gas transport ships, or land vehicles; apparatus and instruments for measuring, monitoring and analyzing the movements of on-board liquids in particular on barges, liquid natural gas tankers, liquefied gas transport ships; apparatus and instruments for measuring the evaporation rate of on-board liquefied gas (boil-off) in particular on barges, liquid natural gas tankers, liquefied gas transport ships; computer interfaces and databases for assistance in the management of the evaporation rate of on-board liquefied gas (boil-off) in particular on barges, liquid natural gas tankers, liquefied gas transport ships, or land vehicles; ship movement measuring sensors; fluid temperature, flow, pressure measuring sensors; gas analyzing sensors; electronic media for training in the use of embedded software in particular on barges, liquid natural gas tankers, liquefied gas transport ships, or land vehicles