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solar flares, tall buildings nearby, RF noise, etc it may take up to half an hour (or more) to get a fix!
solar flares, tall buildings nearby, RF noise, etc it may take up to half an hour (or more) to get a fix!
This does not mean your GPS module is broken, the GPS module will always work as fast as it can to get a fix.</nowiki> </font>
This does not mean your GPS module is broken, the GPS module will always work as fast as it can to get a fix.</nowiki> </font>
=== Résultat - interprétation - Coordonnées - Google Maps ===
Look for the line that says '''$GPRMC,194509.000,A,4042.6142,N,07400.4168,W,2.03,221.11,160412,,,A*77'''
This line is called the RMC (Recommended Minimum) sentence and has pretty much all of the most useful data. Each chunk of data is seperated by a comma.
The first part '''194509.000''' is the current time GMT. The first two numbers '''19''' indicate the hour (1900h, otherwise known as 7pm) the next two are the minute, the next two are the seconds and finally the millseconds. So the time when this screenshot was taken is 7:45 pm and 9 seconds
The second part is the 'status code', a savoir:
* '''V''' that means the data is Void (invalid).
* '''A''' that means its Active (the GPS could get a lock/fix)
The next 4 pieces of data are the geolocation data. According to the GPS, my location is '''4042.6142,N''' (Latitude 40 degrees, 42.3932 minutes North) & '''07400.4168,W'''. (Longitude 74 degrees, 0.4680 minutes West)
To look at this location in Google maps, type '''+40° 42.6142', -74° 00.4168'''' into the [http://maps.google.com/ google maps search box].<br />
Unfortunately gmaps requires you to use +/- instead of NSWE notaion. N and E are postive, S and W are negative.
The next data is the ground speed in knots. We're going '''2.03''' knots
After that is the tracking angle, this is meant to approximate what 'compass' direction we're heading at based on our past travel
The one after that is '''160412''' which is the current date (16th of April, 2012).
Finally there is the '''*XX''' data which is used as a data transfer checksum
Once you get a fix using your GPS module, verify your location with google maps (or some other mapping software). Remember that GPS is often only accurate to 5-10 meters and worse if you're indoors or surrounded by tall buildings.
== Outils ==
== Outils ==