@contrex,
It been around since 1965 at least even if challenge.
http://www.thornwalker.com/honein.shtml
From Merriam-Webster’s Collegiate Dictionary, Tenth Edition (Springfield, Mass.: Merriam-Webster, Inc., 2000):
home vb homed; homing vi (1765) 1: to go or return home 2 of an animal: to return accurately to one’s home or natal area from a distance 3: to proceed to or toward a source of radiated energy used as a guide <missiles ~ in on radar> 4: to proceed or direct attention toward an objective <science is homing in on the mysterious human process —Sam Glucksberg> ~~ vt: to send in or provide with a home
hone in vi [alter. of home in] (1965): to move toward or focus attention on an objective <looking back for the ball honing in —George Plimpton> <a missile honing in on its target —Bob Greene> <hones in on the plight of the common man —Lisa Russell>
usage The few commentators who have noticed hone in consider it to be a mistake for home in. It may have arisen from home in by the weakening of the \m\ sound to \n\ or may perhaps simply be due to the influence of hone. Though
it seems to have established itself in American English (a mention in a British usage book suggests it is used in British English too), your use of it esp. in writing is likely to be called a mistake. Home in or in figurative use zero in does nicely.