What is the difference between CASS, FLS, and OAS sonar systems?

CASS (Collision Avoidance Sonar System), FLS (Forward Looking Sonar), and OAS (Obstacle Avoidance Sonar) are all names which can be used interchangeably when describing a sonar system which looks ahead and is used for navigation. Although there are many products on the market with these names, only FarSounder's products are capable of creating a complete 3D image ahead of the vessel at navigationally significant ranges with a single ping.