I'm sure I already know the answer to this. Let's say you wanted one of these $2500 graphs for your boat. Of course you have a 18-20 footer where you need a bow and a helm unit to be able to see what's under you while running and fishing. Am I correct in assuming you would have to buy TWO of these $2500 units to give you a display at the front and the back? If so, what are some other options?

Other options are units with smaller displays or with less features. The top of the line large screen units with imaging are the $2500 + models.