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Canmore GT-730F Opinions?
LTCSZ
Has anyone out there used the Canmore GT-730F USB Dongle type GPS receiver? Any opinions would be welcome! Thanks,


Steve
Marvin Hlavac
Steve, scroll down to the very bottom of this page till you see the "Similar Threads" feature. There I see three threads with Canmore GT-730 in title.
LTCSZ
Got it...Thanks,

Steve
LTCSZ
Spent the afternoon testing out the Canmore...Seems to work great...Took about 10 minutes for initiation from the initial cold start install...The unit gradually "walked" right to my location...After that, acquisition was almost instant...The software that came with the unit is mysterious, to say the least...I think I am supposed to download something from somewhere to "store" somewhere in the unit, but darned if I can figure it out...Guess I will call tech support...(Good Luck)...Doesn't seem to effect the operation of the unit, though, so maybe I will just leave it alone...Overall, a good buy for 29 bucks...Note: It does a lot better when attached to the little USB "jumper" cord that they supply...Guess it gets it just far enough away from the laptop to prevent interference...

Steve
Marvin Hlavac
Yes, Steve, that's a very good observation, if a USB GPS unit if further away from a laptop computer, it performs noticeably better. Hmm, but reading the marketing material would lead one believe this particular unit is immune to the interference all other units of the same form factor suffer from:

Quote:
Key features:
  1. Excellent GPS performance without the need to use an USB Extension Cable
    Majority of the USB GPS dongles in the market require an USB extension cable to be used to extend the GPS antenna away from the laptop or a GPS position fix may not be obtained or takes forever to obtain a position fix. This is due to the fact that notebook / laptop produces electrical interference that weakens the GPS signal in the nearby vicinity.

Canmore GT-730 supports A-GPS (Assisted GPS). After you install tyhe included application, you will be able to periodically download data which will enable the unit to aquire 3D-fix within only about 15 seconds (even from cold start).
LTCSZ
I think there may be a bit of marketing hype regarding the closeness of the unit to the laptop, but I admit I have not tried it in all circumstances, just in my back yard and in the car...I will be playing with it tomorrow also and will try to do a better study...Having the little jumper cable on the laptop is not really a minus at all...In fact, it would serve to protect the unit and the USB port as it is flexible and not rigid, as it would be simple plugged into the port...I could see it getting snapped off...I will also take another try at the software, but they don't make it easy...

Steve
LTCSZ
I have now successful downloaded and installed the A-GPS for the Canmore...Gives me a lot of info...Of course, I don't understand any of it, but I trust it is good!

Just what is downloaded when I download AGPS data from their server into the Canmore? I understand it speeds up acquisition of satellites, but just what is the data? Thanks for all of the help...

Steve
Ken in Regina
Your search engine and Wikipedia can be your friends if you use them.

Putting "AGPS" into Google yielded the following as the top result.


...ken...
LTCSZ
How often do I need to download the AGPS data?

Steve
tcassidy
It would be useful if you moved a long distance without using your GPS or didn't use your GPS for a month or so. And then wanted it to find where you were without going through the 1 minute cold start. Other than that, it is probably a waste of time.

Terry
LTCSZ
So, in other words, if I never loaded AGPS again, it wouldn't really matter. except for a slightly longer acquisition time...Thanks for the info...

Steve
Ken in Regina
Hey Steve,

Did you read the link I posted about AGPS in my previous post?

...ken...
LTCSZ
Couldn't find it...Where is it? Thanks a lot...

Steve
tcassidy
Ken,
As the Canmore unit is not a cell phone and Steve does not appear to be using it with a cell phone, I don't think that applies. I had understood there were 2 different meanings for AGPS (aGPS) however, I have not been able to determine what type of assistance Canmore is talking about. I think it is more like changing the location that the GPS looks for satellites as in Mobile PC.

Here is a link with some information on the different types or usage of AGPS support.
GPS vs. aGPS: A Quick Tutorial | WMExperts

Terry
tcassidy
A pdf showing how Canmore provides AGPS support.

<edit>Expired link removed</edit>

I can't see how this is advantageous except in very limited situations where you might not be able to get a good signal but have an internet connection. Although the ephemeris data might be good for 6 days, it would be useless as soon as you moved any appreciable distance.

Terry
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