Checking the entered position at the station
>2 – UHF transmitter
Press the S key to stop transmitting
>1 – Position
The screen now shows the distance deviation between the position
you entered and the conventional GPS position computed by the
station. Example:
The position you entered may be regarded as the right one if the
deviation is in the order of the possible accuracy in conventional GPS,
namely less than 30 m in absence of SA (*), which is currently the
case (July 2001), or less than 100 m if the SA was re-activated.
If the deviation is too large, check the coordinates of the point on
which the station is installed as well as the coordinate system used.
If or when the deviation is correct, re-enable transmission :
>2 – UHF transmitter
Press
.
NOTE : This checking procedure only allows you to detect glaring errors.
(*) SA=Selective Availability. Intentional GPS signal degradation under control of USA
Department of Defense.
Deviation between
entered position and
computed position
23