Garmin 520 User Guide

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To set a sonar alarm, from the Home screen, select 

 > 

> 

.

Shallow Water/Deep Water—set an alarm to sound when the depth 

is less than or greater than the specified value.
Water Temp—set an alarm to sound when the transducer reports 

a temperature that is 2° F (1.1° C) above or below the specified

temperature.
Fish—set an alarm to sound when the unit detects a suspended 

target of the specified symbols.

  NOTE: You must have a transducer connected. If your unit does 

not have a built-in sounder, then you must install a GSD 21 or 

GSD 22 sounder module to receive sonar information.

To set a weather alarm, from the Home screen, select 

 > 

> 

. 

  NOTE: You must have a subscription to XM WX Weather and 

the optional GXM 31 antenna plugged into the XM port on the 

back of your unit to view weather information. XM Weather 

is available only on GPSMAP 530/535/540/545 units. See the 

GXM 31 Owner’s Manual for more information.

To configure settings for your boat, from the Home screen, select

 > 

.

Auto Guidance—set the Auto Guidance parameters for your boat:

•  Safe Depth—set the minimum depth (referred to the chart 

depth datum) to allow when calculating an auto guidance path.

•  Safe Height—set the minimum height (referred to the chart 

height datum) of a bridge that your boat can safely travel 

under. 

Keel Offset—offset the surface reading for the depth of a keel. This 

makes it possible to measure depth from the bottom of your keel 

instead of from the transducer’s location. Enter a positive number to 

offset for a keel. You can enter a negative number to compensate for 

a large vessel that may draw several feet of water.

1.  From the Home screen, select

>

>

.

2.  Use the

to set the value of the keel offset.

3.  Press

to accept the number.

  NOTE: Press 

 to cancel your changes and return to the 

My Boat screen.