I am working on a project to convert an old (1962) auto speedometer to all electronic. The speedometer needle will be operated by a servo motor and the odometer will be an LCD panel. I have the needle and LCD panel working properly on the bench, everything controlled by an Arduino Uno. I would like to use a GPS unit to gather speed and distance traveled information. I would like a GPS unit with a fast acquisition time, less than 20 sec. would be desirable. Also I am using the Arduino I2C interface to drive the odometer LCD so I am not sure what would be involved controlling a GPS with an I2C interface. Any advice or recommendations on a suitable GPS unit would be appreciated.
One GPS unit that might be suitable for your project is the Quectel LG69T.
It features the fifth generation of STMicroelectronics® positioning receiver platform, with 80 tracking channels and 4 fast acquisition channels, compatible with up to 6 constellations: GPS, GLONASS, Galileo, BeiDou, QZSS and NavIC (formerly IRNSS). It also supports UART, CAN, SPI and I2C interfaces
Unless you go to the RTK or differential GPSs, then performance wise the standard GPSs are very similar across the different makes.
If size is not an issue then the ones with an 25mm square ceramic antenna will be better, or for a vehicle you might want a GPS that can be fitted with an external active antenna on a cable, GPSs wont work so well inside metal boxes.
The Ublox GPSs do have I2C interfaces, not real issue using that instead of the more normal serial, assuming the module breaks out the I2C connections.
You might want to be careful with choosing the ubiqitous Neo6M, lots of fakes around and they may not accept configuration commands.
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