Okay. So, I'll call on that while he ask a question. So, the Android tablet is a HMI device right? So, the input rating is nine volts to 32 volts on that. Do you think why is that like? Because that's where the machines, that's where they plug it. Because they are operating in 12, 24, right? Yeah, so if you have a 12-volt machine, you have a long power lead or you start drawing a long power starts to droop. Equivalently, you also get a 24-volt machine that, in theory is 24-volt, but it all vary anywhere from 16 up to 30 depending on whether the generator is running, whether the engine is running, whether what partner is running and all that sort of jazz. So, the power for a lot of our stuff has a wide range for input, but it actually has an even wider range for what it can withstand away from negative 40 up to 100 [inaudible]. We have had one of the older displays. It was a Windows CE based box. We specd it and tested it and it would survive having an arc welder all over it. The problem is customers actually do that. I can't stress enough how harsh or preppy the environment is for his stuff, right? Literally people like arc welding on the machine with everything still plugged in or think about jump starting these machines constantly because someone lift the master switch on for the weekend and the batteries are now flat and I've got to get the machine started for the work that's going to be done. It's just horrendous environment, electrically. The whole environment for electronics is horrendous, so that makes it really difficult to make anything that will survive. Okay so you were asking about state estimation, right? So, James is going to help me on this. But, this is where all of it comes together on the machine and obviously we don't have a machine with us today. I'd love to surprise you in the car park, but I can't, maybe next year. But, this is where it all comes together the magic, right? So, you guys after I finish talking, we'll get to lay this out and plug it in and get it working. But, traditionally this is one of mean of all those machines, this is just the excavator, right? So, what we're really trying to get to is making this little tip down here as accurate as we can and we generally make that about get that to about 20 mill. Just under that. But, two GPS receivers at the back. Why would we have two GPS receivers at the back? We can do it with one, but we liked doing it with two. Why would we use two? Echo? No. What does an excavator do a lot of time doing? Spin? Spinning. So, if you only had one? The direction they're facing. Find the relative. Yeah, heating. So, basically we're trying to jump in, but you're trying to get to that center of rotation and then having those receivers spread out at the back of this nice, wide baseline, helps with the mathematics, in a 30-ton excavator, not nominal rates, so I could be the GPS receiver and you could be the bucket. Then, it's a long way when we're chasing 20 mill in both axes right, in vertical and horizontal. So, we want to give ourselves every chance we get. When you think about the other thing, when you look at all these junk, all these synchysis, think about the inherent noise or inaccuracy in each part of it and think about that era envelope growing. Again, I'm back here as a GPS receiver good to about an inch, in each dimension I'm trying to get an inch over there, it's a pretty hard job. Okay. Is data radio generally put that on the back of the care? This is our device gateway so this is our Wi-Fi and our cell connection that generally goes off the back. We turn these machines into an antenna farm basically. This is the boom, this is the stick, this is the bucket, this is the dog bone. You can have a tilt bucket, so it's not just curling, but it's tilting, and you can also get this fancy thing called a tilt rotator, which means the whole bucket, you can spin 360 as well. So, it's like your rest could go right round. Phenomenal to watch, a really good operator working with one of those. So, we put the IMU, boom stick bucket, and if it's a tilt bucket, we have to add one there. So, now we've got, and we also have this guy here, which has got, this is our Linux computer basically, but it's got an IMU in it as well so we got a chassis IMU, two GPS receivers, chassis IMU. IMU is all the way out to the linkage and then we do a big convoluted measure up, measuring all the where the pens are, plug it in [inaudible] and then we could start working out with it where that bucket tip is, relative to world space or site space with the design comes in, load the design onto the display. So, now the machine knows where it is relative to that 3D model that we're trying to build. If it's an automatic machine we have the valve module. So, that little black box is telling the valve module to move the hydraulic ram in a particular sequence if we're automating the machine, which we actually do now on this, it's relatively new. We actually, when we gave this talk last year, we haven't automated this machine, we have now. So, all you have to do now is pull back the stick and our system will automate the bucket and the boom, which is pretty crazy. Like anyone of us could get in that machine and cut a flat surface with the automatic system. I guarantee, you wouldn't be able to do it without it. Any questions? Recall as Ken? We'll get to that, yeah. I have more assistance. Yeah, Ken joined 1939. We'll get to that on this coming slides. Yeah? Yeah [inaudible] but all these are manufactured only for CAT or it's like? No, we sell to Trimble, sells anything aftermarket. Trimble also sells to every other OEM other than CAT. CT which is us, we sell to CAT for factory integration. So, these systems you could buy when you buy a new CAT excavator, just like buying a brand new car, you can tick options. Part of one of those options is grade control. So, it comes from the factory already set up pretty plum, installed, ready to go. But, if you've got an existing machine, yes Trimble will carefully come out and sell you a system and take about all that with automatics would do that 60 grand US for the system. So, you said you've been trying out magnetometers, but how do you organize those because you can't have a metal box for them right? James can take this. He can tell you what, he just tried that on Friday. [inaudible] longer magnet, we have a big aluminum mast moved the magnet cover out of the. All of these is metal steel, so it's very magnetic thing. So, you have a big mast that bring it out, mostly in, and then what's [inaudible]. Great question. You can calibrate it for the magnetic field that is constantly seeing. The problem is when another guy drive past with a big steel machine, it's an issue seen. Yeah. That's a great question. But, there must be some more questions on this slide because this is a lot going on. This is the light bars we talked about, so yeah you'd stick those on the glass, switches on the joysticks. This one, VA boom. Sometimes you get one of these things that has a two piece booms, so there's actually an extra linkage, variable angle booms. We have to add another IMU.
