Given that fitbits and their ilk have exposed the specific locations and layouts of airbases, perhaps they should be a bit more careful with what technology they use, even in their offtime.
Checking them in at a locker at the edge of base is probably sufficient, at least for an airbase. It's not like you can actually hide those in the days ubiquitous satellite imagery, right? For some other types of facilities, maybe check them in off-site somewhere before you transport people in (because otherwise how secret can it be if you can just follow someone's car?).
Letting people transmit GPS coordinates while walking around a military facility though? Yeah, maybe that's not a good idea.
For example you can easily guess everything about ones family members, his work schedule, browsing history, ruffle his personal email/facebook — stuff that often gets mixed with work correspondence, financials, home location, other gadgets, other people in his first circle — people often meet with other servicemen off duty.
