Its in the program, Look around at prior posts. I think the first version of the software, 2.9 ran hotter Higher sensitivity- more tuned for low conducters rather than both. Depth lacked on coins.
Its no legend. I have the upgrade 4.0. I think if you hold in the pinpoint button as you turn it on it tells you the software version. I can tell you this My Gold bug is awesome, If I had to own only one machine this be it. I would say the MXT but its such a heavy beast. Buy a new one it has a 5 year warrenty. I will never sell mine, this is the only machine I have felt this way about. I detect a lot and own other units- but they don't get much use anymore. Only thing it needs is back light and water tight housing then it be perfect. The new F19 has a backlight. Its seems like gold bug on steroids.