Navionics has an expansive database of over 18,000 lakes in 1 ft HD contours for US and Canada! Now we've added hundreds of new lakes that are available on Navionics plotter cards and mobile apps - with more on the way! See the list of new lakes we’ve recently added in the states and province below:
-  388 in Maine
-  188 in Minnesota
-  44 in Florida
-  28 in Illinois
-  14 in Michigan
-  4 in Texas
-  1 in Wisconson
-  44 in Saskatchewan, Canada 
Be sure to check back as more lakes will be coming over the next several months! Updates include many brand new lakes not previously found on Navionics charts, as well as improved detail for existing lakes. 
Fishermen value the amazing detail the SonarChart™ 1 ft HD bathymetry map layer provides for catching more fish. SonarChart™ features extraordinary bottom contour detail, great for increasing awareness of shallow waters and for locating fishing areas at any depth level. In addition, only Navionics integrates sonar logs shared by individual users with existing data to ensure SonarChart™ becomes more and more precise, even in the ever-changing conditions of sea, lake and river bottoms.
Don’t see your favorite lake in our database? Or are you just wishing for better detail on an existing lake? You can visit your favorite lake and record sonar logs on your plotter, then upload to Navionics to build a new and better SonarChart™! Or you can use the SonarChart™ Live feature embedded within the Navionics Boating app that will create personal 1 ft HD bathymetry maps on your iPhone, iPad or Android. SonarChart™ Live is the most efficient way to enhance SonarChart™ because your sonar logs are automatically sent to Navionics from your device. SonarChart™ Live will also be available on select chartplotters soon. Your contributions from both plotter and mobile, along with those from the Navionics Community, mean that any lake can be charted with great detail
It’s the perfect time to update your charts and take advantage of the great additions to our lake mapping database! Whether it’s for your GPS chartplotter or mobile device, here’s how you can get the latest maps on your plotter and mobile!
On your PLOTTER:  
- Purchase a Navionics+ chart card and get the latest Nautical Chart, SonarChart™ and Community Edits  for all of US and Canada plus one year of daily updates or purchase HotMaps Platinum if you want exclusive Satellite Overlay, 3D view and Panoramic Pictures along with Navionics+ charts and features.
- If you already have a chart card from Navionics or even a different brand, you can update and upgrade to Navionics+ with Navionics Updates at half price! See video.
- If you currently own a Navionics+ or HotMaps Platinum, simply perform your daily updates to have the new lakes added!
On your MOBILE: 
- If you are new to Navionics, download the free version of our Boating app. You'll get a one week free trial before the option to purchase so you can explore any of our existing lakes plus the ones we’ve added: select Menu > Charts > USA or US & Canada. Or you can buy Boating USA or Boating US & Canada, which already contain the region. They are available on the iTunes or Android store. Then download detailed maps by zooming in or from Menu>Download Map. 
- If you currently own our Boating app for USA or US & Canada, or the free Boating app with either region purchased, just go to Menu>Update All or Download Map if it is a new area. If you are not able to update your charts, renew your Navionics+ subscription for another year at half price!
Continue to keep maps up-to-date from Menu>Update All (or Download Map). Maps are saved permanently on your device for offline use.
You can check out your favorite lakes on our Chart Viewer too! Zoom in and toggle the SonarChart™ icon to view amazing one foot contours. If you are interested, or know someone who might be, you can add Navionics charts to your website for free with our Web API!