Wow, thanks for all of the thoughtful responses!
Very good advice. I have found the maptech site and have downloaded the map viewer. Then I got some NOAA maps that seem to load into the viewer. This was all free stuff. There must be some features that are not enabled on this software since it is free.
Anyway, it shows me the shipping channels that I should avoid and the bay depths.
Your comments about sunken obsticles sort of perked me up a bit. And all of the tides and things. I guess I have some studying to do.
For the trip I am planning, I would be in sight of the land the whole way, in fact within hundreds of yards probably.
But I am having some second thoughts. I need to learn the things you guys know.
ps. my boat is a 27foot Albin Vega.