I have a Humminbird 500 series with GPS/maps.

I've been tempted several times to buy Navionics maps. Maybe asking too much, but does anybody have link where I can see before and after pics of what the screen looks like with a Navionics may of an area running, vs what it is like with the installed maps that come with the fishfinder.

Maybe even some screen pics, on with the Navionics and one without?

Thanks in advance, it would help me see if I could really use it.