You are in danger reverse course and inform master
infrom master reverse coure check depth of the water
reverse course, inform master, check chart
if u r proceeding north n u c NC mark..dat means u r already in proximity of point of interest or danger...bst action is to inform master and stop ur vsl immediately..plot ur position n chck wer to alter for safe depth of water or away frm danger..
MAINTAINS TANK PRESSURE
KEEPS TANK OUT OF FLAMMABLE ZONE