When I first started sailing, I used paper charts and only a compass to navigate. GPS was too expensive at the time. Now I use a Raymarine chartplotter with multiple backups on a tablet and PC. I only use charts in digital format because they are updated more frequently and less expensive (free) from NOAA.  Both RNC (raster navigational charts) and ENC (electronic navigational charts) can be downloaded from NOAA's website at no charge.  Since I have become more dependent on the digital version, I make it a point to have charts available on a backup PC.  Both the onboard and laptop computers have solid state drives installed for durability. 

I am currently using Rosepoint's New Coastal Explorer for trip planning and reference while underway.  It uses free NOAA raster charts and vector charts which are frequently updated whenever I have an internet connection. 

At the helm I use a Raymarine A65 chartplotter.  This works great on the Gulf coast but on the rivers such as the Tenn-Tom, not so much. Due to some quirk in the chartplotter, I cannot see mile markers and detailed information like I do on Coastal Explorer.  I was constantly having to refer to my tablet, down in the cabin while underway on the river to find what mile marker I was near.  I have since found that there is some convoluted way to determine the mile marker number but with all the keystrokes, it is easier to look at the tablet.  The charts on the chartplotter are not updated as frequently (quarterly) but they are NOAA charts and are $10 through Raymarine's website.  Since cruising up the Tenn-Tom, I have found that Navionics is another option which is especially useful on the rivers due to more detail and mile markers!  Sonar charts provide more detail from crowd sourced data which is especially useful when off the beaten path in an anchorage where the water has not been surveyed or dredged.

The charts for the chartplotter are downloaded from Fugawi since they partnered with Raymarine.  Fugawi Marine 5 software is supposed to transfer routes and waypoints over WiFi to the Raymarine chartplotter.  I can sometimes transfer waypoints, if I can keep Fugawi Marine 5 running long enough without crashing.  If I ever get a stable version to run I will update this page.  In the meantime, I will keep using Coastal Explorer for trip planning. 

I use a Garmin handheld for backup and as an anchor alarm. I also have a USB GPS plugged into a tablet PC.  In the unlikely event the entire  GPS system would go down I could use a hand bearing compass and charts viewed on a PC or tablet.

Local Notice to Mariners

Before starting a cruise a good way to get up to speed on the area is to download the latest local notice to mariners from the USCG District 7 website. or USCG District 8 This site will keep you up to date on any hazards, construction, changes, etc. Any late breaking news can be heard while monitoring channel 16 on your marine radio. The USCG will usually break in a couple of times a day and tell you to switch to channel 22 for the latest local notice to mariners. US Coast Guard Nav Center website.
US Coast Guard Nav Center backup site to be used when the main site is down for maintenance or some other reason.

Tide Tables

I use Coastal Explorer for Tide and Current but the following tidal and current tables are available from NOAA:

Tidal Current Predictions.
Also pick a tide station from a map:
Tide Tables

Other Navigational Links

Navionics Sonar Charts's Data uploaded from other boaters is compiled and displayed by various Navionics products. It can also be viewed on their web app.

Google Earth's satellite pictures aren't always up to date but they are sometimes more current than NOAA charts in some areas, especially after a storm.  Charts are more accurate where commercial shipping is involved.  Some of the areas we cruise don't get the same attention as the more heavily traveled shipping lanes.

NOAA's Charts and Publications page also has a link to download the United States Coast Pilot(r).  This is another good source of information.  There is also a link there to Online Chart Viewers.

NOAA's Coast Pilot page Link to download the United States Coast Pilot(r).

NOAA's buoy data map for Florida may be useful for up to date information on conditions offshore.

AIS (automatic identification system) is getting very affordable and I have seen an increase in the number of cruisers equipped with class B AIS units.  This is especially useful when in close proximity to commercial traffic.  I have had Tows call me and ask what type of vessel I was when approaching a sharp turn.  It's  a good idea to leave AIS on while at anchor in some cases.  MMSI(Maritime Mobile Service Identity) number which can be obtained from Boat US or if you plan to cruise outside the US, you may want to get your MMSI number from the US government by applying for a FCC license. If you have a DSC equipped radio you should already have a MMSI number anyway.  If you don't have a GPS equipped radio it will need to acquire position data from a networked GPS.  A lot of radios now have AIS receivers which will allow a networked chartplotter to display AIS targets.

Even if you decide not to broadcast your position this is a useful app to have on your phone to keep track of commercial ships and tugs while on the water.  Just keep in mind there are limitations especially where there are no land based stations nearby to relay AIS signals to the internet.  This will get better over time.  Coming Soon, class B AIS!

DSC USCG here. Digital Selective calling information from the United States Coast Guard.