Hi, I'm a freelancer from Singapore and I am keen to help you write your proposal on GPS. tracking investment. I understand that you need them within 6 hours and I would be able to commit to it. I am experienced in content and article writing, and I am also an eBook ghostwriter. I've previously worked on an eBook project for teens in the 20s. Please provide me with an opportunity to discuss further with you regarding the project. Thank you.