Apple has bought indoor mapping specialist Wifislam that would allow users to see maps of buildings they enter and would help Apple's mobile map to compete better with Google.
The acquisition, confirmed to the BBC by Apple, could allow the company to offer maps within buildings with an accuracy of 8ft (2.5m).
Rival Google has stepped up its efforts to add indoor locations to its already huge Street View product.
According to the Wall Street Journal, Apple paid $20m (13m) for Wifislam.
In a statement, the iPad-maker batted away speculation about its plans, saying: "Apple invests in smaller technology companies from time to time, and we generally do not comment on our purpose or plans."
Indoor coverage is seen as the next battleground for mapping technology.
Google, which leads the pack, has invested time and money in accepting more than 10,000 floor plans from businesses who want to be featured.
- The Great War: 100 photos marking 100 years...
- Comic-Con's dark side: Harassment amid the...
- Man seeks video of 1995 Oklahoma City...
- Trial begins for Salt Lake attorney seeking...
- Northern California wildfire destroys 10 homes
- Ebola kills Liberian doctor, 2 Americans...
- Judge rules against Donald Sterling, OKs...
- US Court: Virginia marriage is for all lovers
- Federal land managers criticized over... 25
- Feds cap fines for not buying health... 22
- Obama maintains busy fundraising... 22
- After government topples crosses in... 17
- Ted Cruz demands answers on FAA flight... 16
- Fast food workers vow civil disobedience 14
- US Court: Virginia marriage is for all... 14
- Varying health premium subsidy amounts... 13