I got an old vyper that i used years ago as a back up.
I passed it on to my son as its adequate for what he does.
It appears to work fine. Shows the same depth and time, similar enough deco info as my and my other sons computer.
But I'm trying help him log the dives and I cant make heads of tails of anything that is displayed once i enter the logbook mode.
I have consulted that manual and the video suunto put on youtube to no avail.