Representative sites for navigational information:

• www.charts.noaa.gov/OnLineViewer/AtlanticCoastViewerTable.shtml (updated charts online, updated with each Local Notice to Mariners)

• www.saltwatertides.com/pickpred.html (tides)

To get ICW surveys from the Army Corps of Engineers:

www.rci.nao.usace.army.mil/esds/ (Norfolk)

www.saw.usace.army.mil/nav/aiww.htm (Wilmington)

www.sac.usace.army.mil/?action=navigation.survey maps (Charleston)

www.sas.usace.army.mil/navrprts.htm (Savannah)

www.saj.usace.army.mil/Divisions/Operations/Branches/HydroSurvey/hydro.php (Jacksonville)

See relates stories:

- Challenges of the ever-changing ICW

- Watching the bridges

This article originally appeared in the April 2011 issue.