Respected Sir,
We have very vast experience in Android & iOS application development.
We have read your requirement and it seems very easy at glance, however we need more details to get in details and provide you best solution for same.
As per requirement specification provided so far, loging, register, gps, server communication etc are basic features which we generally use in most application. We would like to go ahead with more details.
Please let me know suitable time for you, so we can do initial discussion and start on this.
Regards,
Angel.