Thanks Mike, I have been in contact with Steve at DMI but haven't been able to get a manual or copy of a manual. I sent him an e-mail but I think next week I will give him a call. So far he is the only contact for Datamarine.
I was hoping some one had some experience with this unit, a CD-400, or even a manual. I am trying to find out if it has a adjustable shallow/deep water alarm.