Lowrance 540c baja Guida Al Funzionamento

103 

2. Select 

 and press 

. 

3. Highlight the 

 button and press 

. From the Country 

menu, select the country with DST rules that match your region. 
4. Press 

 repeatedly to return to the map display. 

When the signal is available, your unit will automatically use WAAS to 

boost the accuracy of the position fix. When the WAAS signal is lost or 

acquired, an alarm message appears. Since the U.S. government is still 

developing the WAAS system, its not unusual for a GPS/WAAS re-

ceiver to frequently lose and reacquire its lock on a WAAS satellite. 

That can result in the alarm repeatedly going on and off. You have the 

option of turning off the WAAS Acquired/Lost alarm without affecting 

how the unit uses WAAS.  
To turn on/off the WAAS Alarm: 
1. Press 

|

|

↓  to 

|

|

↓  to 

. 

2. With the option highlighted, press 

 to check it (turn on) or un-

check it (turn off) the WAAS Alarm.  
3. Press 

|

 to return to the map display. 

To Require WAAS: 
1. Press 

|

|

↓  to 

|

|

↓  to 

. 

2. With the option highlighted, press 

 to check it (turn on) or un-

check it (turn off).  
3. Press 

|

 to return to the map display. 

From time to time, Lowrance updates the operating system software in 

some of its products. These software upgrades are usually offered to 

customers as free downloads from our web site, www.lowrance.com. 

These upgrades make the unit perform better and/or introduce a new 

feature or function. You can find out what software version is running 

in your unit by using the Software Information command. 
To access Software Information: 
1. Press 

|

, highlight 

and press 

.

2. Select  

and press 

. Software information will be dis-

played on the screen. 
3. Press 

repeatedly to return to the map display.