What off-line maps exist for your projects (without SaaS services)?

Question

satellite navigation

Hello.
You must use geo-maps for GPS in your mobile service.
WORK WITH CARDS - WITHOUT INTERNET CONNECTION!
Also, you need the ability to update the map from your server in the form of a complete archive or only new changed map data (sections).
(i.e. an analogue of maps on WinPhone - all maps are used there centrally)
What are the options to implement the plan in two possible options:
1. Android, iOS, WindowsPhone
2. Unity3D
Who faced the same issue - a huge request: tell me, please.
In advance, thank you all for your replies.

Answer 1

OpenStreetMap osmdroid aka web version