Garmin 640 Guida Utente

Marine Mode: Advanced Configuration

Weather—configure the appearance of weather options on the 

Navigation chart. This option is only available when connected 

page 45 

for more 

information on interpreting weather features.

Weather—general weather toggle; turn all enabled and 

available weather features on the navigation chart on or off.
NeXraD Loop—toggle the NEXRAD weather overlay on or 

off.
Cloud Cover—toggle the cloud cover overlay on or off.
Visibility—toggle the visibility overlay on or off.
WX Buoys—toggle the WX buoy icons on or off.
Show Weather Legend—shows the NEXRAD/cloud cover/

visibility legend window on the Navigation chart. Touch the 

legend window on the Navigation chart to hide it.

Data Bars—control how charting numbers appear on the screen. 

Choose to show or hide the numbers by category. When set to 

, the overlay numbers appear only when that category is 

active.

Cruising: GPS speed and GPS heading.

Data Bar Setup—specify the position of the data bar on the 

Navigation chart, and specify the contents of the fields.

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Navigation: GPS speed, distance to destination, arrival (time), 

off course, bearing (to destination), and GPS heading. When 

set to auto, these numbers appear only when navigating to a 

destination.

Data Bar Setup—toggle the 

 data field (shows 

additional route information) and specify how each 

data field provides navigation information (by time or 

by distance).

Fishing: Depth, water temperature, and water speed. Depth, 

temperature, and water speed are only available when connected 

to a sonar unit.
Sailing: Water speed, wind speed, wind angle, and Wind 

Velocity Made Good (VMG). Wind speed, angle and VMG are 

only available when connected to an optional NMEA 0183 wind 

sensor.

Wind—choose the type of wind data used in the sailing data 

fields (apparent or true).

Chart appearance—customize the appearance of the Navigation 

chart.

orientation—changes the perspective of the map display:

North up—set the top of the map display to a north 

heading.

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