I'm sure there have been many posts on this subject in the past. My problem is this......I recently purchased an sonar/gps combo along with the Navionics chip. When I power the unit on all I get is an image of the land and water, no contours, depths, boat ramps, humps or anything. NO detail at all. I'm sure there is some simple loading of information that I must do on the front end? Please advise.

Thanks,
Ron

go to menu and click on overlay data. click on what region you want. assuming you have a lowrance that is

I don't know, but I will give you a bump so you can try and get this figured out. Might try contacting the Navionics guys.

need to choose the map data you are tring to view. its like a mini-computer, you need to select what the computer is to read.

First make sure you're in the right section of the country,west Texas,east Texas etc.If you're in the right area then take the chip out and reinsert it.I had to do this on my 332c.Hope this works

go to map data and scroll down to N tex or NE tex and that should fix problem