How to build built-in map navigation for an iOS application?

I have a requirement mentioned below:

• You already have an image of the plan on the plan.
• First determine the current location on the floor
• Then select a destination using the plan map image.
• Now the application should indicate the direction and distance for this path to the destination path.
• This is similar to how Google works, but its internal map requires it.

For example, - The user's current position: at his desk - Where is Conference Hall No. 11 - Thus, the application should provide an update of the direction and distance on the map / floor plan image.

Any suggestions / help would be great.

Thanks in advance