Garmin GPSMAP 640 - Manual (Page 45)

GPSMAP 620 and GPSMAP 640 Owner’s Manual 39
Marine Mode: Advanced Configuration
GpS—view GPS information and change GPS settings.
• Skyview—view the GPS satellite constellation.
• WAAS/eGNoS—toggle WAAS (in North America) or
EGNOS (in Europe) on or off. WAAS/EGNOS can provide
more-accurate GPS position information; however, when using
WAAS/EGNOS, the device takes longer to acquire satellites.
• Speed Filter—the speed filter averages the speed of your boat
over a short period of time for smoother speed values. on keeps
the speed filter on continuously. Auto allows the unit to provide
the optimal performance as required by your situation, such as
traveling at a constant speed or frequently changing speeds.
System information—view system information, restore factory
settings, view the event log, and save system information.
• Factory Settings—erase all user settings and return the device
to factory default settings.
• event Log—view a list of system events. Select an event to
view additional information.
• Save to Card—save system information to a memory card as a
troubleshooting tool. A Garmin Product Support representative
may ask you to use this information to retrieve data about the
network.
Speed Sources—specify if the calculated wind speed data comes
from a Water Speed sensor, if it is based on the GpS Speed, or
whether the chartplotter selects a speed data source automatically.
Water speed is the speed reading from a water-speed sensor, and
GPS speed is calculated from your GPS position.
Usage Mode—change to automotive mode.
Changing Units of Measure
From the Home screen, touch Configure > Units .
System Units—specify system-wide units of measure: Statute
(mh, ft, ºF), Metric (kh, m, ºC), Nautical (kt, ft, ºF), or Custom .
Touch Custom to individually define units of measure for:
• Depth—set the units of measure for depth to Feet , Fathoms , or
Meters .
• temperature—set units of measure for temperature to
Fahrenheit (ºF) or Celsius (ºC) .
• Distance—set the units of measure for distance readings ( Miles ,
Kilometers , or Nautical Miles ).
• Speed—set the units of measure for Vessel Speed and for Wind
Speed readings ( Miles per Hour , Kilometers per Hour , or
Knots ).