GPS troubles

Van Dessel

I'm currently working on a project that finds the latitude and longitude and stores the information on a data logger.
I got everything working properly except that the latitude and longitude isn't accurate enough; 72 dgrees longitude could be anywhere from boston to 100 miles in!!· I was wondering if this is just a limitation of my gps (PMB-248 GPS reciever from parallax) or is my code missing something.

gps.readNEMA                            'Finds an NEMA string
lights(1)

USB.OpenForWrite(string("data.txt"))    'Writes to the data.txt file and records        
USB.WriteLine(string("longitude is..."))         
USB.WriteLine(num.ToStr(atoi(gps.longitude,3),Num#DEC3))
USB.WriteLine(string("Latitude is..."))
USB.WriteLine(num.ToStr(atoi(gps.latitude,2),Num#DEC3))

I'm using GPS_IO_Mini_PNAV thats slightly different·as an object to read the incoming data and Numbers to create the string.

Thanks

kf4ixm

im new to prop programming, so take this with a grain of salt, but from looking at the code im thinking the DEC3 should be a higher value, like DEC6, this would give you a 6digit varible string instead of trunctuating the data to just the first 3 digits. maybe someone with more prop experience can verify this, or debunk as the case may be.

Van Dessel

I tried a higher value however it then just fills with zeros. so DEC8 gave me 00000072 or something similar to that

jcwren

I'm new to all this too, but if your latitude is 34.172656 and you're using atoi() (Alpha to INTEGER), what's the integer value of 34.172656?

--jc

kf4ixm

did you try changing the varible (atoi(gps.longitude,3) to something like (atoi(gps.longitude,6)?

Van Dessel

thanks kf4ixm i over looked that. now it works!! thanks

kf4ixm

anytime, glad to be of help!