Ice Cube Tray exercise.(positioning, navigation, and timing capabilities)

Decisions made over the next five years to launch, cancel, or curtail U.S. programs will determine positioning, navigation, and timing (PNT) capabilities over the next twenty years--how the picture will look in 2025. In this context, it's important to take a strategic outlook, to see if a more effective overall system could be had for the same or even perhaps less cost.

Upcoming decisions in which the PNT Architecture determination may play a role include:

* Future of eLORAN

* Future of NDGPS and High Accuracy NDGPS

* Backup satnav tas