“Sense and avoid” for drones is a popular topic in the press right now, but the phrase can mean different things in different contexts and for different people. To clarify, there is a difference between solving the problem of “sense” and solving the problem of “avoid.” Also, there is a difference between “airborne collision avoidance” (which is what most concerns the FAA) and “obstacle avoidance” (which is the problem that most manufacturers are trying to solve right now). With that in mind, this post looks at what a few manufacturers and software providers are doing to solve obstacle avoidance.