Chapter 8
KGP-920
Setup Procedure
8-2
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8.2 Menu 3: GPS
8.2.1 Monitoring GPS satellite signal reception
You can monitor the signal status from GPS (SBAS) satellites. The signals from 3 satellites are used for
two-dimensional positioning, but signals from 4 or more satellites are required for three-dimensional
positioning.
(1) Press [
MENU
] key until Menu options 1 to 9 appears.
(2) Press [
3
] key to select “
3:GPS
”.
(3) Press [
1
] key to select “
1:GPS MONITOR
”. Reason for alarm notification is displayed
8.2.2 Selecting a measuring system mode
initial setup: 3D
There are the two modes, 2D and 3D, in a measuring mode. Usually, it is used in 3D mode. Usually, in
3D mode, in case use it in 2D mode, they need to set up an antenna height manually. (see 7.2.4)
If you cannot receive signals from four satellites or if the PDOP value exceeds the limit, the
3D
(three-dimensional measurement) mode is automatically switched to the
2D
mode.
(1) Press [
MENU
] key until Menu options 1 to 9 appears.
(2) Press [
3
] key to select “
3:GPS
”.
(3) Press [
2
] key to select “
2:FIX MODE
”.
(4) Press [ ] or [ ] key to select desired measuring system mode.
(5) Press [
ENT
] key.
8.2.3 Selecting a geodetic datum
Initial setup: WGS-84
The latitude and longitude are calculated based on the WGS-84 with GPS system. However, the charts
used in many countries are based on different geodetic datums. You can compensate this difference
from your chart by converting GPS position data into your actual chart system. To select a geodetic
datum, see "Local Geodetic System" (Annex).
(1) Press [
MENU
] key until Menu options 1 to 9 appears.
(2) Press [
3
] key to select “
3:GPS
”.
(3) Press [
3
] key to select “
3:DATUM
”.
(4) Press [ ] or [ ] key to move cursor onto the desired geodetic datum.
(5) Press [
ENT
] key.
Satellite PRN
(Pseudo
Random Noise) number
.
Azimuth angle of satellite
The angle of satellite from true
north (0 degree)
Elevation angle of satellite
The angle of satellite from
horizon
Satellite signal S/N
The S/N usually shows 10 to 20
when elevation angle is above
10 degrees.
SBAS
satellite information
DOP(PDOP or HDOP)
value
