The encoded audio output level of GeoAudio+ can be adjusted via the output level
potentiometer VR1. GeoAudio+ supports microphone to line level output. (Tick #5 of
#11 is default.)
GeoAudio+ can be powered by internal 4 AA batteries or external USB source. The AA
batteries can be installed even when a USB power source is supplied. Move the POWER
switch to the desired position. (See Figure 1.0) The green POWER LED on the top of
the case will turn on once power is applied.
Figure 1.0 – Power selection switch
GeoAudio+ Cable Hookup and Operation
GeoAudio+ has two operating modes Encode and Decode:
- Encode mode is used during the video recording process to encode the GPS
information onto the camcorder or DVR (digital video recorder) left or right
- Decode mode is used during the video playback to convert the encoded audio back
into a GPS NMEA serial stream that GPS mapping software recognizes. During
decode mode the yellow GPS Fix LED will blink.
The ENCODE or DECODE operation mode is selected via the slide switch on the side
of the case. (See Figure 2.0)
Figure 2.0 – Mode selection switch
Encode Mode (Recording) Cable Hookup:
Use the supplied 6’ 3.5 mm audio cable to connect GeoAudio+ to the camcorder mic
input or DVR (digital video recorder) audio input. (See Figure 3.0 and 4.0)
Figure 3.0 – Camcorder Recording Hookup Figure 4.0 – DVR Recording Hookup
Encode Mode (Recording) Operation:
After powering-up GeoAudio+ the yellow GPS Fix LED on the top of the case will
turn on once there is a good GPS fix (a minimum of 4 GPS satellites are being tracked.)
If the yellow GPS Fix LED does not turn on after approximately 2 minutes then verify
that the GeoAudio+ top of the case is facing up to a clear view to the open sky or the
optional external GPS antenna has a clear view to the open sky.
Decode Mode (Playback) Cable Hookup:
There are several playback hook-up options:
- Option #1 (see Figure 5.0) - use the supplied 6’ 3.5 mm audio cable and 6’ USB
A-Male to Mini-B cable to connect GeoAudio+ to the user’s PC.
- Option #2 (see Figure 6.0) - use the supplied 6’ 3.5 mm audio cable and 6’ USB
A-Male to Mini-B cable to connect the camcorder, GeoAudio+, and the user’s PC.
- Option #3 (see Figure 7.0) - use the supplied 6’ 3.5 mm audio cable and 6’ USB
A-Male to Mini-B cable to connect the DVR, GeoAudio+, and the user’s PC.
Figure 5.0 – PC Playback Hookup Figure 6.0 – Camcorder Playback Hookup
Figure 7.0 – DVR Playback Hookup
Decode Mode (Playback) Operation:
The yellow GPS Fix LED on the top of the case will blink during decode mode. For
PC operations please see the following sections for USB device driver installation and
mapping software configuration. Once the USB device driver has been installed then
PC mapping applications such as Google Earth can be used to view when and where
the events in the video being played back occurred.
The proper playback audio level must be set for reliable GPS decoding. Start with a
low output level then increase until reliable decoding occurs. DO NOT TURN THE
VOLUME TO MAX!
GeoAudio+ Windows USB Device Driver and Diagnostic Utility Installation
A USB software device driver must first be installed on a Microsoft Windows® PC
before GeoAudio+ can interface with PC applications. GeoAudio+ includes a disc with
the Microsoft Windows® USB device driver and GeoAudio+ Diagnostic Utility. Please
contact us for information regarding Linux and MAC OS X driver installation.
USB Device Driver:
To install the GeoAudio+ USB driver insert the supplied disc and run CDMxxxxx_Setup.exe.
If there are no error messages then the device driver was installed correctly.
The first time GeoAudio+ is connected to the PC and powered on Windows should display two messages “Installing device driver software” followed by “Your device is
ready to use.”
GeoAudio+ Diagnostic Utility Installation:
The GeoAudio+ Diagnostic Utility (see Figure 8.0) is a tool for verifying that the
GeoAudio+ is connected to the PC properly and decoded GPS information is being
received. GeoAudio+ Diagnostic Utility is not required to use GeoAudio+ but helpful
To install the GeoAudio+ Diagnostic Utility insert the supplied disc, run setup.exe,
and follow the installation instructions.
Figure 8.0 – GeoAudio+ Diagnostic Utility
Mapping Application - Google Earth
GeoAudio+ can interface with most GIS (geographic information system) mapping
applications such as Google Earth. Google Earth requires a 4,800 baud rate so confirm
GeoAudio+ is configured for 4,800 baud (see Dip Switch Configuration above).
The supplied GeoAudio+ virtual COM port software driver causes the GeoAudio+
USB device to appear as a PC serial COM port. Mapping software such as Google
Earth can access the GeoAudio+ USB device in the same way as it would access a
standard PC serial COM port attached to an external GPS receiver.
To access Google Earth GPS real-time mapping functionality go to the Google Earth’s
menu bar option “Tool” then select “GPS.” From the “GPS Import” window
(see Figure 9.0) select the “Realtime” tab. The “protocol” option must be set to NMEA.
Once the “Start” button is clicked then Google Earth will search for valid serial COM
Ports. Once the GeoAudio+ serial COM Port is found (GeoAudio+ must be decoding
data at that time) then Google Earth will begin updating the map.
Figure 9.0 – Google Earth - GPS Import Window