Read "The Global Positioning System: The Path From Research to Human Benefit" at NAP.edu

Loading...

Subscribe

First Name
Last Name
Email (required)
I agree to receive emails from the National Academies (required)

We respect your privacy and will never share your information.

Log In

Sign in to access your saved publications, downloads, and email preferences.

Former MyNAP users: You'll need to reset your password on your first login to MyAcademies. Click "Forgot password" below to receive a reset link via email. Having trouble? Visit our FAQ page to contact support.

Members of the National Academy of Sciences, National Academy of Engineering, or National Academy of Medicine should log in through their respective Academy portals.

Email (required)
Password (required)

Don't have an account?

Register

Email (required)
New password (required)
Retype password (required) Password must be at least 8 characters
I agree to receive emails from the National Academies
I accept the terms of use
terms of use

Download as a Guest

While logged on as a guest, you can download any of our free PDFs on nationalacademies.org . You will remain logged in until you close your browser.

Email (required)
Yes, send me emails when similar titles are published
Yes, I accept the terms of use
terms of use

Thank You

Thank you for creating a MyAcademies account!

Enjoy free access to thousands of National Academies' publications, a 10% discount off every purchase, and build your personal library.

Forgot Password

Enter the email address for your MyAcademies (formerly MyNAP) account to receive password reset instructions.

Reset Requested

We sent password reset instructions to your email . Follow the link in that email to create a new password. Didn't receive it? Check your spam folder or contact us for assistance.

Reset Password

New password (required)
Retype password (required) Password must be at least 8 characters

Reset Password

Your password has been reset.

Log In

Verify email

Verify Your Email Address

We sent a verification link to your email. Please check your inbox (and spam folder) and follow the link to verify your email address. If you did not receive the email, you can request a new verification link below

The Global Positioning System: The Path From Research to Human Benefit (1996)

Chapter: Time and Location, Precisely

My Academies

The Global Positioning System: The Path From Research to Human Benefit (1996)

Chapter: Time and Location, Precisely