Owner's Manual
GPSMAP 620 and GPSMAP 640 Owner’s Manual 39
Marine Mode: Advanced Conguration
—view GPS information and change GPS settings.
• —view the GPS satellite constellation.
• —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.
• —the speed lter averages the speed of your boat
over a short period of time for smoother speed values. keeps
the speed lter on continuously. allows the unit to provide
the optimal performance as required by your situation, such as
traveling at a constant speed or frequently changing speeds.
—view system information, restore factory
settings, view the event log, and save system information.
• —erase all user settings and return the device
to factory default settings.
• —view a list of system events. Select an event to
view additional information.
• —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.
—specify if the calculated wind speed data comes
from a sensor, if it is based on the , 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.
—change to automotive mode.
Changing Units of Measure
From the Home screen, touch > .
—specify system-wide units of measure:
(mh, ft, ºF), (kh, m, ºC), (kt, ft, ºF), or .
Touch to individually dene units of measure for:
• —set the units of measure for depth to , , or
.
• —set units of measure for temperature to
or .
• —set the units of measure for distance readings (,
, or ).
• —set the units of measure for and for
readings (, , or
).