Garmin 640 Guida Utente

Marine Mode: Advanced Configuration

Turn the following alarms on or off:

Marine
Tornado
Severe Storm
Flood
Flash Flood

From the Home screen, touch 

 > 

.

auto guidance—select the Auto Guidance parameters for your 

boat.

Safe Depth—set the minimum depth (using chart depth 

datum) to allow when calculating an auto-guidance path. A safe 

depth of less than one meter is not allowed when using Auto 

Guidance.
Safe Height—set the minimum height (using 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, 

making it possible to measure depth from the bottom of the keel 

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

offset for a keel. Enter a negative number to compensate for a large 

vessel that may draw several feet of water.

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1.  From the Home screen, touch 

 > 

 > 

.

2.  Use the on-screen keyboard to specify the offset.

If you are measuring down to the keel (Intelliducer installed 

at the water line), enter a (+) positive number.
If you are measuring up to the water line (Intelliducer 

installed on the keel), enter a (-) negative number.

3.  Touch 

 to accept the number.

turn transition Distance—set how far before a turn in a route 

that you transition to the next leg.

From the Home screen, touch 

 > 

.

  Note: To configure AIS or DSC information for other boats, your 

unit must be connected to an external AIS or DSC device.

aiS—turn AIS on or off. AIS alerts you to area traffic by providing 

boat IDs, position, course, and speed for boats that are within range 

and equipped with a transponder.
DSC—turn DSC on or off.

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