I LIVE IN SOUTH CENTRAL lA. i FISH THE BASIN AREA and sometimes I fish the marshes south of here. I don't kinow how good coverage is good in these areas with bluewater maps. I don't have any place close to go check out the maps. When I asked garmin where i could get a demonstration, they just told me to go to my nearest dealer. Went to one and they said they had no way to show a demo. The topo maps from this site are pretty correct for my area. Would like to be able to compair. Thanks