This is big news since Amazon did not allow Google services (Google Location API, Google Maps, etc) to be placed on its tablet and developers had no real solution for location and or maps. Now they do with the NBI LBS SDK.
It is known that the Amazon Kindle fire tablet has no GPS chipset. The only way to get location positioning is via the WiFi chipset. NBI has it's own WiFi location services, as we wrote about it here.
See here how some developers are using NBI LocationKit and MapKit.