Better GPS?

I like using Google Maps turn by turn navigation. However,my Verizon Galaxy S 3 frequently gives me a "GPS signal lost" spoken message. While usually it will begin working a few seconds later,many times at critical moments the pointer in maps will just drift off the road as though it doesn't know my position.This can last for a minute or two at times.

This has led me to wonder if a bluetooth gps receiver such as the Garmin Glo might give me more consistent results from my phone.Its my understanding that phones have assisted GPS (A-GPS) which helps to get a quicker position fix. By comparison Standalone receivers like the glo do not have this ability as it would rely on getting additional satellite data from cell towers which phones GPS has the capability of doing due to its cellular connection. Of course there is still a market for separate receivers and standalone units which makes me wonder if they are better in other ways.

If I used a separate receiver for my phone would the phone still assist the satellite signal with cell tower data? If not would this matter for getting a more consistent lock?Also If I used a Garmin Glo or something similar with a tablet having no cell connection would I get a full featured experience from Google Maps navigation? Would I need to use a Garmin navigation app instead? A lot of questions here. I appreciate anyone's attention.

 

Thanks stuntman and codesplice for your replies. I read your link,codesplice,which answered more questions for me,thanks. From what I can gather,the standalone (and bluetooth receiver) versions are in all ways superior to the a-gps versions due to their higher powered chips.If Im correct,the only reason cell data is needed in a phone is to make up for the compromises needed to fit this ability into a phone due to cost,power, and possibly space considerations.

I'm am curious however if the google maps and navigation app for phones will have compromised functionality in ANY way not having cell data. Will not only maps but navigation,traffic data,and its ability to reroute you on the fly be negatively affected with an app designed for a phone? Also,for driving purposes,are any of the other apps better or quicker at adapting to real time changes in road conditions?

 

So it sounds as though the Garmin Glo Bluetooth receiver would not work with Google Maps if you want real time rerouting on a tablet without a data connection? Are there programs that would allow navigation and rerouting using a receiver on such a tablet?

Also, if I used a Bluetooth receiver (for its better chip),the bluetooth gps android program with "allow mock locations" enabled to make use of the receivers output,and just used my phone ( instead of a tablet ) would google maps still pull real time data for rerouting purposes from my phones data connection? Do other programs allow for rerouting without the need for a data connection?