Hi Jeremy,
There is no interference of any electromagnetic signals (like the one from the GMRS radio) with the PPT, as this works purely optical).
The Intersense InertiaCube2 is using the earth-magnetic field for avoiding drift, so you should avoid placing something made out of solid iron in it's direct surroundings. In a typical setting, however, it's mounted on top of the HMD and the little GMRS radio will not cause any problems.
Looks like a good deal!
Matthias
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