given the fact crappie like to hold tight to cover , does chirp help? i know it can help with say bass , walleye ,and cats holding close to the bottom. but what about in brush ? and if you have changed from a none chirp to a chirp unit can you tell the difference? if so would you buy your next unit without it or would that be a deal breaker ? sorry if y'all have heard this question before i am currently using a 365i ( grayline ) i going to buy a 7 or 9 in. si unit . i know anything , will blow what i am use to out of the water . but with the prices i have seen ,it will be a while be i can do again. thanks