Board Thread:Speculation House/@comment-4141313-20180330215009/@comment-27144409-20180330231708

Well the implication, from WOR, seemed to imply that while a notable attempt at settlement had been made, it was wiped out. Granted there was also the implication that a relay tower was built there, which somewhat lessens the likelihood that the unnamed continent is such a hell on Remnant, that after all the pointless death the people  of Remnant collectively went, "WE GIVE UP! NO MORE OF THIS STUPID PLACE!"

I do think that Remnant could build, both manned unmanned, high altitude, high speed aerial reconnaissance vehicles capable of flying higher and faster than any Grimm we've seen on screen (I'd like to see a Gryphon just try to stop an SR-71 once she's really gotten flying. On the other hand, it's possible that Salem has a few elite interceptors that take down anything close, or maybe she has Grimm that can fire long range attacks, similar to the Sea Feilong's lightning blasts, serving as anti-air units.

They may (read: should) realize that she's on the unihabbitated continent that is particularly hostile, but trying to run thorough recon of an entire hostile continent seems like a risky and costly endeavour. Not to mention that even if you spot her castle and relay the intel back before being neutralized, it's entirely possible that she can make an emergency relocation of her command infrastructure, or she may have other strongholds that serve as decoys, alternate locations which she rotates through, and or backups.

The best bet for thorough, consistent, long term surveillance with an emphasis on minimizing casualties, equipment loss, engagements, and costs would be a network of high altitude sensor/communication balloons (an R[?] rated GI Joe mini-series called them "stratellites.")