Fishermom - welcome to S-B ... To look up something specific you could do online maps at maptech.com. More generally you could go to NOAAs site :
http://nauticalcharts.noaa.gov/mcd/enc/index.htm and download ENC chartfiles and an ENC viewer (you might need to google it). These are not printable nav maps in the sense of replacing paper charts / GPS chartplotters but it's good running on a PC at home