Garmin GPSMAP 4008 Owner's Manual page 49

Configuring a Graph
You can set the scale and duration of the Atmospheric Pressure and Depth graphs. The duration represents the
time interval that appears on the graph, and the scale represents the range of the measured data that appears on
the graph, including specific maximum and minimum values.
1. From the Home screen, select information > Graphs.
2. Select Atmo. Pressure or Depth.
3. Select Graph Setup.
4. Complete an action:
• Select Duration, and select Up or Down to set the duration.
• Select Scale. Select Up, Down, or Auto. When you select Auto, the chartplotter sets the optimal
minimum and maximum values for the range, based on environmental conditions. When the
chartplotter receives new data about environmental conditions, it adjusts the scale automatically.
• Select Reset Scale to allow the chartplotter to set the optimal minimum and maximum values for the
range, based on environmental conditions. Reset Scale is only displayed when Auto is already selected
for Scale.
• For Atmospheric Pressure only, select Press. Ref, and select the reference time used to calculate the
barometer trend displayed in the top left corner of the graph.
Wind Speed Data
Selecting Apparent, True, or Ground Wind for the Wind Graph
The chartplotter must be connected to the peripheral devices listed below to capture the data shown on the
wind speed graph.
Wind Speed Description
Apparent Wind Shows wind speed data based on the flow of
air experienced while on a boat in motion.
True Wind Shows wind speed data based on the flow of
air experienced while on a stationary boat.
For the most-accurate data, the Wind Speed
Source setting should be set to Auto
(page 52).
Ground Wind Shows wind speed data based on the flow of
air experienced while on shore.
1. From the Home screen, select information > Graphs > Wind Speed.
2. Select the type of wind speed data included on the graph (Apparent Wind, true Wind, or Ground
Wind).
Configuring the Wind Speed Sources
You can specify whether the vessel speed data displayed on the compass is based on water speed or GPS
speed. Water speed is the speed reading from a water-speed sensor, and GPS speed is calculated from your
GPS position.
1. From the Home screen, select Configure > Preferences > Navigation > Speed Sources.
2. Select Wind.
3. Complete an action:
• Select Water Speed to indicate that the calculated wind speed is based on data from a Water Speed
sensor.
• Select GPS Speed to indicate that the calculated wind speed is based on data from a GPS antenna.
• Select Auto to allow the chartplotter to select a speed data source automatically.
GPSMAP 4000/5000 Series Owner's Manual
®
Almanac, Environmental, and On-boat Data
Required Sensors
A wind sensor.
A wind sensor and a water speed sensor; or a
wind sensor and a GPS antenna.
A wind sensor, a water speed sensor, a
heading sensor, and a GPS antenna; or a
wind sensor and a GPS antenna; or a wind
sensor, a water-speed sensor, and a heading
sensor.
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