As harvest has started down under, and ive been slowly munching away at plots in my Wintersteiger, ive been thinking about an idea.
Many modern GPS systems have an offboard GPS reciever that exports signal to the main computer, via serial or some sort of AMP or Deustch connector. Would it be viable/worth attmeping to put an F9P or UM928 with an IMU onto a separate board in a separate enclosure (similar to the NAV900 or a Greenstar receiver), so it can communicate back to the PCB via serial or ethernet? I am envisaging that this can be used as a universal receiver with screens such as Pro700 or Topcon X35, which are commonly used as an isobus terminal, or even to replace aging, outdated receivers with a cheap, high accuracy unit?
It would make it easier to swap between vehicles while just leaving wiring behind to plug everything into, but i am not sure of the physical or technological implications of having this offboard the main pcb.
Cheers 
Creating a PCB with an IMU, GNSS receiver, microcontroller, Ethernet, power over Ethernet, and provisions for an antenna is easy.
So far there has not been an apparent solution for the enclosure of this device. It needs to be inexpensive, waterproof, UV proof, have a waterproof Ethernet connection, be simple to mount to a roof, have some impact resistance, and be somewhat aesthetically pleasing.
You expect a Deere or Trimble antenna to sit outside for 10+ years without anyone ever touching it. Ours should be able to do that too. How?
3d printing has to be an option? Property treated ABS or ASA prints shoukd be sufficiently weatherproof, while also being able to be styled. Failing that, a Tupperware container with sone spray paint and magnets on the bottom!
I personally like the PoE Ethernet idea for AgOpenGPS but to use it with any other system I think it would need some other connection/data/power option. Most other systems would work with RS232 and 12V power?
@PotatoFarmer has developed a F9P based PoE receiver meant for a 3D printed enclosure.
I’ve been looking for an antenna enclosure with room for a UM982 reciever
They also sell a full kit but I’m not sure what it exactly is
There’s survey antenna shells like this
I wonder if this has room for an extra PCB