i realise this may be a dumb question but i have new Garmin 95sv chirp and have only been out with it a couple of times. Haven't done much research or read the manual yet but just wondering how do you properly identify reef and hard bottom? I have had furunos in the past and generally yellow is sand and red is reef or hard bottom. I have played around a little and from what I can gather hard bottom comes up thicker but does not change colour? Also looking at real view you can see more structure? I generally stick to traditional view. I realise chirp and 200khz frequency may also show different. If anyone has experience with this unit any information on this would be awesome. Thanks