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GPSMAP 400/500 Series Owner’s Manual 
Getting Started 
Initializing Unit Settings
The first time you turn on your unit, configure the initial settings.
NOTE: You can change these settings later using the Configure 
screen (
).
Language—select the language to display on the screen.
welcome—select 
OK
.
Store demonstration—select 
NO
. (This option is only available 
the first time the unit is turned on.)
NMEa 0183 devices—if you have NMEA 0183 devices connected 
to a serial port, specify which ports are connected.
aiS Receiver (not available if you select 
None
 for NMEa 0183 
devices)—Select 
yes
 if one of the devices connected to a serial port 
is an AIS (Automatic Identification System) receiver.
Position format—specify the coordinate system to use for location 
readings.
Time format—specify whether you want the time shown in a 
12-hour24-hour, or UTC
 
(Universal Time Coordinated) format.
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 
StatuteMetric, or Nautical, or select Custom to individually 
define units of measure for depth, temperature, distance, speed, 
elevation, volume, and pressure.
Minimum 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 sonar 
depth data. Select 
yes
 or 
No
.
Overhead Clearance—select the minimum overhead clearance for 
your boat. Refer to your boat specifications for more information.
aiS alarm Range (not available if you select 
No
 for aiS 
Receiver)—select the distance within which an alarm will sound if 
).
aiS alarm Time To (not available if you select 
No
 for aiS 
Receiver)—select the time within which an alarm will sound if an 
AIS vessel is on track to intersect the Safe Zone around your boat 
(
).
If a water speed wheel is detected, a message will ask if you want to 
calibrate it now. Select 
yes
 or 
No
.