Learn to keep some trouble, (not all) away.

Make sure seals and tamper indicators are not broken or missing. Make sure pressure gauges or indicators read in the operable range. (CO2 extinguishers do not have gauges and instead must meet a minimum weight requirement.)

Class A Fire Ordinary Combustibles (anything that burns and leaves ash)

Are you in need of more boating education? Do you have piloting experience in the class of boat that you are purchasing?