3.1.3 Mobile Operator
The Mobile operator Element, similarly to any mobile phone, provides an indication about the commu-
nications operator, and the GSM signal quality. Signal quality is shown graphically. The relationship
between what is shown and the signal quality can be seen in Table
3.3
.
Table 3.3: GSM signal quality graphic description
Symbol
Description
GSM signal level 5
GSM signal level 4
GSM signal level 3
GSM signal level 2
GSM signal level 1
Additionally, next to the symbol, a message is draw which provides information about the network provider.
The description of each message can be seen in Table
3.4
.
Table 3.4: Network related messages
Symbol
Description
Operator
GSM Operator name.
No service
The GPS SD+ has not yet, or can't connect to the GSM Operator.
No SIM Card No SIM card detected.
Disabled
GSM module disabled. This can be done manually through the
Settings, or automatic if no SIM Card is detected.
3.1.4 GPS
The GPS Element provides graphical indication about the current GPS signal quality. Basically, the
lower the PDOP value (position dilution of precision), the more accurate calculations are for determining
position. Values bellow 3.0 are fairly accurate. The relationship between what is shown and the signal
quality can be seen in Table
3.5
. Note that FAI rules require 3D tracklog data, which includes GPS altitude.
Table 3.5: GPS signal quality
Symbol Description
3D position with a PDOP bellow 1.5
3D position with a PDOP between than 1.5 and 2.0
3D position with a PDOP between than 2.0 and 3.0
3D position with a PDOP greater than 3.0
2D position (no altitude information)
No GPS Signal
Therefore the GPS SD+ will only start recording a tracklog when 3D information is available. The GPS
SD+ has an high sensitivity 50 channel GPS receiver which oers unmatched tracking performance in harsh
signal environments (-160 dBm sensitivity), and very short acquisition times. The GPS SD+ has a 4 Hz
9
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