I contacted MRT regarding the differences between the two and got a roundabout answer. It was a proprietary software for Gulf customers ect.

I really would like to know what the operating differences are. They sell with 2 transmitters and one picket link. How are the two systems different? In the gulf FB page they talk about flying a drone to 3,800', how's that different to what we do.

I so badly want a GPS system for my cast just don't want to buy the wrong one.