It looks like Amazon is building up its presence in the mapping business. The tech giant today closed a deal to acquire 3D mapping startup UpNext. For Amazon, which doesn’t have a mapping service of its own, the acquisition seems to mark a move into new territory. To access maps on the Kindle Fire, users must download third-party Android apps or access online mapping services through the browser. The Kindle Fire doesn’t currently include a GPS radio but the UpNext acquisition, which would help Amazon offer native mapping capabilities, potentially points to a more robust Kindle Fire in the future, as well as an Amazon smartphone. Read the full story at GigaOM.