check this out:
http://www.subsim.com/radioroom/showthread.php?t=170997
if you click on one of the support icons, a sircle will show on the map. you are supposed to be able to move your boat within the sircle, click the icon and set a waypoint close to your current position and a resuply ship will come. But if you look at the above link, it doesnt seem to work.. at least for me
nappy-in-deep-doo-doo