No Decompression Tracking
Gauge mode only features depth and bottom timer functions, with no decompression tracking. Therefore, there will be no NDL or decompression stop.
Gauge Lockout
Air/ Nitrox /Multi-Gas modes will be locked for 24 hours after the last gauge dive. To unlock, go to the Settings menu > System > Reset Nitrogen.
Gauge Main Screen

Press the C button to switch screens. 
Before diving, press the B button to enter dive settings. 
- Top: GPS Indicator (Green indicates successful GPS fix)
 - Top Middle: Bottom Timer – Press the A button to start the timer; pressing A again will restart it.
 - Left: Water Temperature | Ascent/Descent Rate Bar (displayed during the dive)
 - Middle Right: Dive Depth
 - Bottom Right: Dive Time
 - Bottom Left: Average Depth
 - Bottom: Battery Level
 
Gauge Compass Screen

Press the C button to switch screens. 
Before diving, press the B button to enter dive settings.  

Press the A button to lock the heading. The locked heading is indicated by a green arrow, while the relative heading is shown with a white arrow.
For example, if you lock the heading at 90 degrees, the display will show green when approaching 90 degrees.
Press the A button again to cancel the heading lock.
Gauge Info Screen

Press the C button to switch screens. 
Before diving, press the B button to enter dive settings. 
- Top Left: Compass Bearing
 - Top Right: Surface Time
 - Left: Water Temperature
 - Right: Current Depth
 - Bottom Left: Average Depth
 - Bottom Right: Maximum Depth