Light aircraft like the mavic can go beyond 400ft depending on where they are, not near airports obviously. The only caveat to VLOS is that you must still be able to perceive depth in order to avoid collision with property, people or other aircraft in the event of an emergency. That is what the VLOS rule is for, to be able to see and avoid. Technically, if you can still see a little dot, then yes you are flying VLOS, but you are not able to accurately judge distance/depth and therefore cannot competently see and avoid. Just a little something to consider. This is why I don’t like taking my mavic much further than 400ft. That’s about my comfort zone with young, non glasses equipped eyes.