Gauge mode gives you depth and time, and nothing else -- In other words, it doesn't track or display NDL time remaining. It's useful for people who want to manage their own profiles, and for people who are doing decompression diving. I like it because it puts the dive time in the biggest numbers, right in the middle of the screen, and displays seconds, which makes it easier to time stops.
Bismarck, you can run the Mosquito in computer mode, and it will serve as a backup bottom timer/depth gauge. You just ignore the NDL information, and as long as you are diving reasonable profiles and remember to set it for the gas you are using (which I forget to do) it's unlikely you will put it into deco, and if you do, your minimum deco ascent should clear it.
Bismarck, you can run the Mosquito in computer mode, and it will serve as a backup bottom timer/depth gauge. You just ignore the NDL information, and as long as you are diving reasonable profiles and remember to set it for the gas you are using (which I forget to do) it's unlikely you will put it into deco, and if you do, your minimum deco ascent should clear it.