Why are all the GPS and other radar stations in West Antarctica with none in the East??

In the last post, I pointed out how the new logo of the ATS (Antarctica Treaty System) has red longitude and latitude lines around Marie Byrdland -- which has no research stations -- and green on the other side of McMurdo up about halfway then it's white.

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Felix pointed out in the comments section that that the Marie Byrdland area is absolutely studded with GPS and other types of radar stations. 

Now why should that be? I'm of the opinion that GPS is not a satellite system- just another type of radar. But look at the number of radar installations all over Byrdland. What's going on here? And why are there none on the other side? They say they're measuring earth tremors. But is that a cover story? Is this part of a massive security system to keep out intruders? Sophisticated burgler alarms? Motion detectors for people rather than earthquakes? source:

http://polenet.org/wp-content/uploads/2014/03/2014_2015_Basemap_3March14.jpg

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