Hi All, I have a Garmin 740s gps w/ sonar. I want to add radar. I was told by one installer that the 48 mile unit vs 36 mile, would give better clarity ie. 2 bouys would show rather than one blip. I thought it would be best to get the 48 mile, even though the cost is almost double $1,100 vs $1999, because by 7 inch screen is rather small, so the added clarity would be needed. I have a 36' single engine boat, and plan on only icw costal crusing.This is all new to me, so any input would be appreciated. Thanks