Garmin 190-01230-10 User Manual

Getting Started 

Time Zone—set the time zone you want displayed for time 

readings. If auto is selected for the Time Zone, the DST option is 

not available and is automatically set to auto.
System Units—specify units for on-screen measurements as 

Statute, Metric, or Nautical, or select Custom to individually 

define units of measure for depth, temperature, distance, speed, 

elevation, volume, and pressure.
Minimum Safe depth—select the minimum safe depth for your 

boat. Refer to your boat specifications for more information.
Shallow water alarm—only available if you are receiving NMEA 

sonar depth data. Select 

 or 

.

Minimum Overhead Clearance—select the minimum overhead 

clearance for your boat. Refer to your boat specifications for more 

information.
aiS alarm Range—select the distance at which an alarm will 

sound if an AIS vessel nears your boat (

aiS alarm Time To—select the time within which an alarm will 

sound if an AIS vessel is on track to intersect the Safe Zone around 

If a water speed wheel is detected, a message will ask if you want to 

calibrate it now. Select 

 or 

.

1.  Press and release the   

 key.

2.  Press left or right on the 

 to adjust the brightness.

To allow the unit to automatically adjust the backlight based on 

ambient light, select 

(automatic backlight is 

available only on the GPSMAP 526 and 556).