If you go to Maintenance section, click on "S22 Owners Manual" in the "Manuals Section" This is a huge PDF file, but good to have. In section 1, pages 3, 4 and 5 it explains how to set different alarms and their paremeters on your DDU,( Digital Display Unit) such as depth, oil pressure, Fuel remaining and other stuff. As Capt. Rick metioned, your alarm may have come from your depth finder which may have momemtairly had picked up a real shallow reading ( .02 ) and sent the alarm. Were you launching the boat or pulling into a slip or happening to be beaching your epic (God Forbid!) when the alarm whent off? Usually, there is a heading over the alarm, that would say oil pressure, fuel or depth but you may not have noticed. Let me know if this has helped.
Breakawaydaze