Originally Posted by catamount
One consideration that may be often overlooked is the issue of power consumption. I don't know about modern RADAR systems, but traditionally RADAR has had pretty high power demands (e.g. on my Dad's old boat, granted with limited battery capacity, if you wanted to run the RADAR you pretty much had to have the engine running as well).
In this context it is worth noting that BBR (currently only offered by the Lowrance group) uses far less power than traditional RADAR.