Las pruebas que he hecho son gracias a información procedente de un foro específico para esta máquina Pda-Gps-Gsm que tengo (Mio A701). En el portátil aún no lo he probado porque no lo saco a mucho a pasear
Igual te sirve la info..
(Fuente Oki)
INTRODUCTION
This post describes the easiest way on how to get DGPS system working in our A701.
There are 3 Satellite Based Augmentation Systems (SBAS) planned:
- The European Geostationary Navigation Overlay System (EGNOS) developed by the European Space Agency (ESA)
- The Wide Area Augmentation System (WAAS) developed by the Federal Aviation Administration (FAA) covering North America
- In Asia, it's the Japanese Multi-Functional Satellite Augmentation System (MSAS).
They improves the precision and accuracy of global positioning system (GPS) signals. It uses correction signals generated at many ground-based stations that are then broadcast across the covered area from a number of specialized communications satellites. Designed primarily for aviation users, SBAS systems improves even the vertical accuracy of the GPS signal by approximately 5 times to less than 3 metres, 1 meter in regular conditions. WAAS also provides integrity information for each satellite's signal, equivalent or better than Receiver Autonomous Integrity Monitoring (or RAIM).
That way virtually all errors can be eliminated from the system, even the pesky Selective Availability error that the DoD puts in on purpose.
How can we then improve the precision of the A701?
Configuring The SiRF Star III GPS module
Actually you can use a lot of different software for this, but the easiest one is Memory-Map SiRF Setup.
Install it like any other PPC application but do not run it. First you have to check in Configuration > System > Memory > Running Apps that there is not any application running in background. It is mandatory that there is not any other GPS application while running Memory-Map SiRF Setup. Read below the bad experience lived by Spikesclone if you do perform this check.
Run Memory-Map SiRF Setup and you will see this screen, the only one:
Configure COM2 @ 57600 bauds and tap on "WAAS on" button.
If you receive an acknowledgment window then your GPS is configured.
If you want to check if SBAS is working, install and open VisualGPSce using COM4 and wait for a Fix. Be sure that you have good view of the geostationary ecliptic since the SBAS satellites constellation is there.
You should see that channels 11 and 12 are now receiving signal from a satellite with a number greater than 30 and the status bar in VisualGPSce does not say "GPS SPS Mode", instead you should see "Differential GPS", the led will not blink in green, instead it will do in a nice bue:
NOTES:
- Memory-Map SiRF Setup is fully WM5 compatible but do not run it while running any other GPS application, I have had locks up when doing it.
- If you run into a lock because of the previous note, you can recover the initial GPS state by removing the battery for at least 60 seconds. It is safe and you will not lose any application data thanks to the new WM5 memory architecture.
- If you do not know what Static Navigation is then leave those buttons alone, Statick navigation is another feature of SiRF GPS modules but there is not a wide consensous on it.
Enjoy your A701 with improved precision!!!!