What advantage does using a multi-beam sonar system have over using a single beam system?

The benefits of multibeam echo sounders are that they map the seafloor by a fan of narrow acoustic beams, thus providing 100% coverage of the bottom. The resulting seabed maps are more detailed than those obtained using single-beam mapping. The maps are also produced faster, reducing your ship survey time.

Explanation:

i think the reason that they immagrated was to find freedom of religion