I was thinking that if the Garrett Ace 150 is electronically the same (pretty much) as the Garrett Ace 250, there must be a way to install a momentary switch to add the pinpoint feature that the 250 has. Would need to know what has to be added and where to add it. Not sure if this can be done but wouldn't it be nice if it could. Thanks! Steve. P.S. Really enjoy this forum.