I go to www.maptech.com You can see topo charts, nautical charts, aeronautical charts, and satellite photos. As you move the cursor, you can see GPS coordinates in the left-hand margin, and write them down to enter into your GPS.
Do some digging but go to NOAA.GOV and download the ENC charts for the area and go around and find an ENC Viewer (there are several free with limited capacity)