The GRS-1 is a 72-channel GPS/GLONASS Dual Frequency receiver
integrated with an internal computer and Windows Mobile operating
system with touch screen, a digital camera, a Bluetooth® wireless
technology module, a Wireless LAN module, an electronic compass,
and an SD card slot. The portable design and product integration
allows this device to be a fully-functional, productive tool at any job.
Performance specifications assume a minimum of 6
GPS satellites above 15 degrees in elevation and
adherence to the procedures recommended in this
In areas of high multipath, during periods of large
PDOP, and during periods of increased ionospheric
activity, performance may degrade.
Use robust checking procedures in areas of extreme
multipath or under dense foliage.