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.
- 11 best—and worst—state tax systems
- Scotland votes to remain part of United Kingdom
- Review: Larger iPhones eliminate reason to...
- Iranian youth behind 'Happy' video sentenced
- How much America wants to be taxed
- 'Gotham' actor's Penguin inspired by DC Comics
- Chiefs' Reid dedicated to domestic abuse victims
- Fence-jumper made it through front door of...
- US wealth gap putting the squeeze on... 27
- Striking or spanking a child is not a... 19
- President Obama: Ebola outbreak a... 15
- Chicago, NY, Hawaii on Obama library's... 12
- School police stock up on free military... 11
- Yellen says US families need to boost... 10
- US won't rule out working with Iran... 7
- Gamers use police hoax to lash out at... 6