GPS vs GNSS

Other than a bit quicker response time and satelite availability is GNSS worth it? I mean, it can cost tens of thousands of dollars, in equipment costs, more to get essentially the same information as GPS-only type of equipment.

How long would it take to recover those costs?

Just throwing it out there so, please, for discussion only...

Thanks

i onced asked about this difference.
if we are going by ratio/proportion the addition of 24 new satellites should have increased your accuracy into the submillimeter level.unfortunately accuracy is still in the 1-3 millimiter level.

i am talking from a small business surveyor point of view.  if buying gnss equipments will NOT increase my accuracy level then why bother?
gps is still reliable (within the next 10 years anyway) so from business sense then i would stick to gps equipments.

Actually the price difference between GNSS receiver and GPS receivers are very small, few hundred dollars.
So, can buy one GNSS receiver at a very low price.

If your a GIS pro, then the tower "gps" found on your phone is even better than survey-grade GPS. You can get to a few feet or less if your in a box of towers. If, however, your doing survey work then always buy the GNSS equipment if you can afford it. 

Space programs are running almost exclusively through Russia now, and as the other countries get their systems up and running GNSS will keep on getting better while GPS stays the same or degrades as old sats break down or have to go off-line for whatever reason. Also as better reference surfaces come available they may require access to the GNSS network to be useful. Not having the right equipment in the near future may count as negligence on your part if you don't use the correct reference and state what your system is looking at.

If your really want to find a good answer, see if the CORS in your area are referencing GNSS and GPS. If your on a cellphone based reference then your already using GNSS and need the hardware. Some dealers may be able to upgrade your current system to accept GNSS code, I don't know if they do that kind of thing but it would be cheaper than buying a new system.

Use of a GPS-only system would not be cost-effective for most of the work I do.  In northerly latitudes under tree cover it can be hard to get "fixed" RTK positions with GPS-only systems.   The GNSS Sokkia GSR2700 ISX system I eventually purchased is very good in tree cover.    Difficult-to-get RTK solutions still require an independent "fixed" observation to verify the original result or disclose a potential error. 

GNSS  is stnds for Global Navigation Satellite System and it is used to mean GPS or other comparative systems. While it can be used for a GPS only system it's generally used in regards to a system that can choose up both GPS & GLONASS.

The International GNSS Service formerly the International GPS Service, is a non-reflex federation of more than 200 gloabal organizations that share resources & lasting GPS & GLONASS station information to produce accurate GPS & GLONASS products.