GPS with OSD (On-Screen Display) is a tool for FPV piloting. The GPS unit is connected to a OSD and overlays the info on the FPV pilots monitor or Goggles, usually in the corners of the screen.
Most companies that produce OSDs for RC come with or have an available GPS module and data loggers that connect easily to their OSD board which is what I would recommend to keep the hook-up simpler. Data Loggers like Eagle Tree Systems eLogger v3/v4 are necessary componets nowadays. Data loggers have hook ups for hardware and sensors like OSD, GPS, RPM, Temp, Speed, Altitude, Battery volts, Stabilization etc...and then can be overlaid on the viewing monitor.
There's also OSD's stabilization that have artificial horizons sensors that will help the FPV pilot with more info on climb, descent rates, level flight and amount of banking in a turn. This part of the display will be helpful when flying through fog, dust, low clouds and my favorite...Night Flights.
In order for you to see the GPS and sensor info on your screen all you need to do is connect the FPV camera to the "video in" and connect the wireless transmitter to the "video out", along with connecting the GPS /sensors If needed). This will allow the info to be overlaid on your screen. Then supply the recommended power and that's it. This is the basic OSD but they can be much more complicated if using RTH due to programing but even still it's not that difficult.
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