Navionics will be introducing SonarCharts for Garmin units in 2015. They would like to give out FREE testing charts just for Garmin in return you give them your feedback. Navionics want to have the product perfect before they launch it. Navionics SonarCharts for Garmin will be breaking the contours down to onefoot in 18,000 Navionics Lakes and out to 80 feet in coastal areas. Beyond 80 feet for saltwater its 3 foot contours to 250 ft and 6 foot beyond that. The first 20 people that send me a private message with your name, address, phone number, email, and plotter type will receive a Navionics card.