Mobile Sound Viewer shows where comes from loudest noise at long distance. It is in fact able to detect noise until 50 meters. That is often sufficient to identify major sources of overall noise noted at area of complainant by example, or on property lines. MSV is very useful to show loudest source between fans, turbines, cool pack, transformer as well. By the way, MSV shall be so aligned to disturbing noises and adjusting distance by zoom. MSV is very convenient when MSV detection is made where trouble is noted. The result showing identified source is now difficult to contest.