The Vyper can also be supplied with a compass, SPG or both. Good for aggressive diving. High degree of adjustability. Progression of information access is reasonably laid out. Allows excessive number of deep repetitive dives.
Illumination is done with a tap switch that functions poorly and provides uneven lighting.
Instructions are a poor translation that are unclear, incomplete, incorrect, have explanations that do not agree with the illustrations or the actual displays and, in places, use the wrong names for the computers. Prompt cards are generic and do not match these computers. Alternate screens and alternating numbers are unclear as to meaning, significance and units of measure. These two computers are new to Underwater Breathing Systems, but are based on obsolete technology that is also packaged by other companies under several different brand names. When this type of dive computer was first distributed, it was useful.