Tip & How-To about GPS

Correcting GPS Satellite Reception Problems for some Receivers


There is a way to "persuade" many GPS units to use a specified communications port and baud rate for receiving the satellite signals. You need to have a little programming knowledge to do this. This may not be the problem with your unit, but it works on some receivers.

I cannot tell you all the exact procedures for doing so for each individual GPS receiver, but you may be able to do it yourself if you are bold enough, or have a friend who is experienced in basic programming. Make sure you backup and rename any files being modified, as improper code might put your unit to sleep...maybe forever.

All GPS receivers have a "setup" or "configuration" or "sys" file in the unit's main memory software that tells it how to startup and load all the various configurations...just like a Windows PC.

In one of the files will probably be a few lines of code as follows:

[gps]
port=2
baud=38400
gps_maximise_baud=0


Your unit may have something similar to the above code. Find out what your communications Port is, and the Baud rate the modem is running, and that should force the GPS to run on those defaults. Some units will run ok on "auto" setting for the port. If you're game, it's worth a try.

One other little tidbit of programming info:

Something that has always annoyed me is the really slow simulation speed when you're trying to run through your route. Some units will allow a faster than 1X (real time) speed drive-through. Real time is sooooo slow. Look at this code:

[navigation]
sim_speed_factor=1


Now look at this:

[navigation]
sim_speed_factor=4


Which one would you rather put up with? The above information may not be feasible for everyone, but it's worth attempting if you want to try. Just be aware that it may VOID your warranty, if you're within that period.

These are just some suggestions to try. Maybe you can use them. If you do try, let me know how it works out. Thanks.

Regards, Bill

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1 Answer

will not recieve sattilite signal


Hi dcross93,

Correcting GPS Satellite Reception Problems for some Receivers

There is a way to "persuade" many GPS units to use a specified communications port and baud rate for receiving the satellite signals. You need to have a little programming knowledge to do this. This may not be the problem with your unit, but it works on some receivers.

I cannot tell you all the exact procedures for doing so for each individual GPS receiver, but you may be able to do it yourself if you are bold enough, or have a friend who is experienced in basic programming. Make sure you backup and rename any files being modified, as improper code might put your unit to sleep...maybe forever.

All GPS receivers have a "setup" or "configuration" or "sys" file in the unit's main memory software that tells it how to startup and load all the various configurations...just like a Windows PC.

In one of the files will probably be a few lines of code as follows:

[gps]
port=2
baud=38400
gps_maximise_baud=0


Your unit may have something similar to the above code. Find out what your communications Port is, and the Baud rate the modem is running, and that should force the GPS to run on those defaults. Some units will run ok on "auto" setting for the port. If you're game, it's worth a try.

One other little tidbit of programming info:

Something that has always annoyed me is the really slow simulation speed when you're trying to run through your route. Some units will allow a faster than 1X (real time) speed drive-through. Real time is sooooo slow. Look at this code:

[navigation]
sim_speed_factor=1


Now look at this:

[navigation]
sim_speed_factor=4


Which one would you rather put up with? The above information may not be feasible for everyone, but it's worth attempting if you want to try. Just be aware that it may VOID your warranty, if you're within that period.

These are just some suggestions to try. Maybe you can use them. If you do try, let me know how it works ou. Thanks.

Regards, Bill

Sep 19, 2010 | Tomtom ONE XL GPS

1 Answer

no valid GPS signal for two days, what I can do?


You can try a reset Check in the manual where the reset hole is i thinlk this model is under the scfreen surround which is removable.

This will take ut back to factory settings, you might want to check if its set to the right PORT and BAUD try this

GPS Program Port: COM1
GPS Hardware Port: COM9
Baud Rate: 4880
Manage GPS Automatically (Ticked)


Now other reasons are low battery= low signal//fully charge the battery


no signal from satellites= damaged SIIRF chip caused by plugging into car power when starting engine...needs new m/board

Maximum time to access 1-9 minutes max...




Please rate my help++++Thanks for using FIXYA...

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Dec 01, 2009 | Tomtom ONE GPS Receiver

2 Answers

can not get a valid gps signal


Cannot get a valid GPS signal=
not fully charged on AC charger
not right baud rate or port
antenna disconnected inside unit
Burned SIIRF chip ( from plugging in to car power when starting engine)

Try charging the unit fully first......

rare for antenna to become disconnecetd unless dropped or opened.

baudrate and port can often be found automatically in GPS settings

Burned Chip requires a full Motherboard replacement Might as well buy a new GPS cost exceeds value.


Please rate our help to keep the FREE service online++++Thanks for using FIXYA

Sep 07, 2009 | Tomtom GO GPS Receiver

1 Answer

after installing iGo navigon no gps signal


You must edit port and baud rate in sys file. If dont know parameters just write:
[gps]
port="auto"
baud="auto"

Aug 26, 2009 | Navigon 5100 GPS Navigator Handheld GPS...

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