more answers

diff --git a/FAQs/ublox_limits.mdwn b/FAQs/ublox_limits.mdwn
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+# What altitude limits exist for the GPS receivers on Altus Metrum products?
+
+The U-blox parts we use perform well in airborne mode, and are the gold 
+standard for hobby rockets.  However, series 8 and below reportedly stop 
+reporting above 50km altitude, and series 10 stops reporting above 
+80km.  We do not have flight data from anyone who's gone that high to confirm
+or deny this, though others report confirming it with GNSS simulation systems.
+

diff --git a/FAQs/viruswarning.mdwn b/FAQs/viruswarning.mdwn
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+# What do I do about a virus warning when installing AltOS?
+
+As long as you're downloading from altusmetrum.org, any virus or trojan
+warnings you get, particularly on windows, are false positives.  
+
+We build everything from source using only open source tools on a well 
+maintained Linux system, sign all our installers with a Microsoft-approved
+cryptographic key, and distribute the bits from a well maintained Linux 
+server we own .. so there's really no plausible chance of infection.  We're 
+highly confident that there's nothing vile in our code, and there's no 
+way for us to know what about our builds might cause them to appear to 
+still look too much like a virus in the minds of some anti-virus tools.
+
+If your anti-virus tool is complaining, the best thing to do is report
+this false positive to your vendor.  If they hear about it often enough,
+maybe they'll fix it for you.  In the meantime, the only answer we know of 
+is to turn off your anti-virus tools long enough to download and install 
+our software.