the reason for the arrows is so that you don't have to slow down for every ping. if you get a ping and the arrow provides the additional info needed, you then can decide if it's worth slowing down or not. an unidentified ping means you slow down for them all because that one extra bit of info is missing.If getting a valid alert well in advance and slowing down isn't enough, buy a V1 so you know in which direction to look for the threat(s) while you slow down. The 'arrow people' will be along to say that a detector without arrows is useless