How Does Pulsar Technology Could Revolutionize Technology And Space Travel?

In the International Space Station, NASA experiments and shows how more explorations into space may make it easier to maneuver through a deep space and be able to locate the missions position in this deep space. This is done in an ethereal kind of “Global Positioning System or GPS” if you can have a GPS without the global. This form of tracking is using signals from dead stars in deep space that are always constant. The Neutron Star Interior Composition Explorer or NICER took a day and a half to look at pulsars. Pulsars are twirling remnants of stars that emit radiation as they spin. If measured in the tiny changes of the landing times of theses emotions NICER can find out the location of the explorer within three miles or five kilometers.
It shows great promise as a way to track and communicate as we expand our knowledge, but I am still wary of the technology that I believe has not been tested enough and in different ways. I would especially like to know the range of pulsars and how far we can detect and use them. If we get too far away will we lose the spacecraft? Especially if pulsar technology becomes our primary source of tracking. What if there are no pulsars near the spacecraft and we cannot track them what will we do? How can we make a way to track with no faults and despite the great tidings pulsar technology brings it is not fool-proof and I worry that we will become naive and believe that we will always be able to track and then we lose some people to the great expanse of space. I do believe that this is a good way to track when possible, but we need a back-up and inexpensive way to track and not just the conventional way. I feel that pulsar technology is efficient if we cover the gaps in the technology that would allow us to make deep space travel perfect. I would also like to know how expensive NICER and SEXTANT are and if it is worth it. The scientists say that it is relatively inexpensive, but you never know and that cheap for NASA is different than cheap for regular people. I would prefer more details about this experiment and this navigation in order to keep a reliable and perfect way to keep us from worrying where the spacecraft and astronauts are and whether they know where they are going and their destination. Even then if they don't know where they are then they will not be able to get back to Earth and describe what they recorded. I think this is a great way to navigate if it