OMGEMN1.41
GEM2000 Range Gas Analysers
Page 44
Copyright 2009 Geotechnical Instruments (UK) Limited
4)
If no ID is required ‘Key 5’ to ‘Select no ID’ and then ‘Key 1’ to exit tracking.
5)
Once the operator selects a borehole ID the ‘GPS Navigation’ screen is displayed.
N:
Latitude displays as degrees, minutes, seconds and decimal
seconds. The equator is 0.
E or W:
E (East) or W (West) displays the longitude as degrees,
minutes, seconds and decimal seconds. The Greenwich
meridian defines the zero point.
A:
Altitude displays in meters or feet.
Sec:
This is a seconds counter which will reset after 59.
Status:
No Satellites
No Fix
Bad Fix
Good Fix
Status indicates the status of the satellite fix:
No satellites can be detected.
The GPS chip cannot see sufficient satellites to obtain a fix.
The GPS chip can get a fix, but will not produce a very
reliable position.
A good fix has been obtained.
UTC:
‘Universal Time Code’ received from the satellite and
displays GMT.
No. Satellites:
This is the number of satellites that the system can see in
the sky. Four satellites will give reasonable position
accuracy, eight or more is better.
Herror:
Estimate of horizontal error on the indicated position. The
location is accurate to horizontal error 1.6m.
Verror:
Estimate of vertical error on the indicated position.
HDOP:
‘Horizontal Dilution of Precision’ which measures the
accuracy of the indicated position:
1
Ideal
Between 1-2
Excellent
Between 2-5
Good
Between 5-10
Moderate
Between 10-20
Fair
Direction to
the target
Distance to
the target
^
N
Direction to
the target
Distance to
the target
^
N
Direction to
the target
Distance to
the target
^
N
Direction to
the target
Distance to
the target
^
N
