They have been using two systems. The transporters have a system by GlobalWave and it's extremely accurate and reliable but not cheap, it's the first one that they got and have been using it for about 6 yrs now. They are also using a new cheaper system on all the other stuff, trailers, gen set, etc even the owners personal aircraft has one, it's called Land-Air-Sea and they like that one a lot. I'm sure you can google them. As I mentioned there are several systems on the market now.
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