"on their whereabouts" is correct and usable in written English.
You can use it when you want to ask or discuss about the location of someone or something. Example: I have no idea on their whereabouts, last I heard they were traveling abroad.
Indeed, some lobbyists appeared unaware of the restrictions placed on their whereabouts.
When elephants are in mobile phone coverage, we can receive data on their whereabouts in real time.
Anyone with any information on their whereabouts is urged to call Avon and Somerset Police on 101.
That led the F.B.I. to put out an alert on Dec. 29 seeking information on their whereabouts.
Presidential candidates now advise millions of people on their whereabouts through Facebook, while offering videos of appearances.
Agent Gary Webb of the Federal Bureau of Investigation said that officials did not have any leads on their whereabouts.
"The actress is fine, but I like the person behind the actress". Mack said Taylor had her two sons on set and was always on top of their whereabouts.
Figure 2 shows the proportion of victimized respondents whose partners often prevented them from seeing friends (16.8%), insisted on knowing their whereabouts (29.0%), got angry if they spoke with other men (26.0%), and forced to have sexual intercourse (29.3%).
The Department of Immigration has no detail on their current whereabouts.
But most interesting is a new feature that enables users to "pin" playlists to a location or venue and, in turn, discover music based on their current whereabouts.
Thing-to-person and person-to-thing communications encompass a number of technologies and applications, wherein people interact with things and vice-versa, including remote access to objects on the part of humans, and objects that continuously report on their status, whereabouts and sensor data.
