PMB-648 Altitude reading accuracy
Does anyone have any insight as to why the altitude data varies so greatly using the PMB-648 GPS module?
Over the last couple of days it has returned values ranging from 177 meters to 209 meters while sitting on my desk.
I know that data comes from GCA sentence.
Thanks,
Ron
http://www.gpsinformation.org/dale/nmea.htm#GGA
Over the last couple of days it has returned values ranging from 177 meters to 209 meters while sitting on my desk.
I know that data comes from GCA sentence.
Thanks,
Ron
http://www.gpsinformation.org/dale/nmea.htm#GGA
Comments
Do an advance search on GPS, accuracy, altitude. There have been many discussions about it. The accuracy is just not there, you need a barometric sensor for accurate readings. Also, you will get more accurate reading if the GPS is moving. My Parallax GPS will vary 100 meters if it is not moving.
Jim
Thanks Jim.
I wasn't sure if some sort of calculation adjustment was needed or whether it just wasn't reliable.
I do the advanced search and check it out.