Casio IT-800 Series, Software Manual

Page: 138 / 325

138
GSA Sentences
This outputs GPS DOP and active satellite data.
Example of output:
$GPGSA,A,3,13,17,28,04,02,23,,,,,,,2.38,1.54,1.82*09
Table 2.104
Item Description Validity
$GPGSA Yes
A Positioning mode
A = 2D/3D auto-select
M = 2D/3D manual-select
Yes
3 Positioning status
1 ＝ no signal
2 ＝ 2D
3
＝
3D
Yes
13,17,28,04,02,23,
, , , , , , Satellites from which signal is being transmitted.
Displays up to 12 satellites. Yes
2.38 Shows PDOP. The PDOP is the coefficient of position dilution
determined by the position of the GPS satellite/s. The smaller this
value becomes, the more accurate the position. Yes
1.54 Shows HDOP. The HDOP is the GPS coefficient of horizontal
dilution. The smaller this value becomes, the more accurate the
position. Yes
1.82 Shows VDOP. The VDOP is the GPS coefficient of vertical
dilution. The smaller this value becomes, the more accurate the
position. Yes
*09 Checksum Yes
Note:
“Yes” indicates the presence of the valid output.
“No” indicates the absence of the valid output.