Specifications

220 Z-Family Technical Reference Manual
HGT: Height Model Selection
$PASHS,HGT,s
Select the height used in the position output messages, where s is a 3 character string:
ELG: (default) output ellipsoidal heights in position messages.
GEO: output orthometric heights in position messages using worldwide
geoidal model.
This does not affect the position output in the B-file or in the PBN message which are ECEF and
always with respect to WGS84.
To remain NMEA standard, the GGA message will always output geoidal height whatever the
selection is. This selection affects the height value in other position messages such as POS, UTM and
GDC.
Example: Select geoidal height in position output.
$PASHS,HGT,GEO <enter>
$PASHQ,HGT,c
Query height model selection where c is the optional output port.
Example: Query the HGT status to port C.
$PASHQ,HGT,C <enter>
$PASHR,HGT
The response message is in the form:
$PASHR,HGT,s*cc <enter>
where s is the 3 character string that denotes the current height setting (ELG or GEO).
UDD: User Defined Datum
$PASHS,UDD,d1,f2,f3,f4,f5,f6,f7,f8,f9,f10
Sets the user defined datum parameters in the receiver memory where:
Table 6.153: UDD Message Structure
Param
eter
Description Range Units Default
d1 Geodetic datum. Always 0 for WGS 84. 0 n/a 0
f2 Semi-major axis 6300000.000-
6400000.000
meters 6378137.000