Not merely a mapping system, the augmented sonar can also serve as a system of movement detection under the proper circumstances. Fast-acting and with virtually no power draw, the augmented individual is able to develop a very crude sense of their environment and motion within it.
At Rank 1, the sonar mapping system needs a point of visual output to present its data. In a pinch, this can be (and often is) the individual's cybereyes or computer eyewear. This blinds the user to any visual input aside from their sonar data. Otherwise, it can be presented to another display device - a palmscreen or projector RIG, whichever is handy.
At Rank 2, the sonar mapping system is advanced enough to interface directly with a user's cranial computer and cybereyes to present a collapsed ubiquitous view of its data as a display overlay, adding its side and rear data as a highly condensed peripheral field of view and updating that data in real time. While this takes some getting used to, the result is a solid sense of one's environment and local motion.