The new DJI OSD Displays a ton of information for the FPV pilot. Battery voltage, distance from home, altitude, control and failsafe modes, attitude (pitch and roll), speed, number of GPS satellites detected, video input selection, and vertical rate of ascent or descent.
This information will be displayed as a video overlay of your flight camera and will be displayed on screen or in your goggles.
It is designed to plug easily into the WK-M with minimum of connections. I can be used with any video transmitter, but is easiest to use with the DJI line of video downlinks.
The is one of the latest additions to the professional line of products from DJI.