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i-Blue GM-2 USB GPS Receiver
OneRVer
Alright, I downloaded the GPSview off of this site. Change my receiver to 115200, 5 repeats per second. Opened up Copilot and "no gps signal", which is right because I change the baud rate. Went into gps setting and change the baud rate from 9600 to 115200. Still "no gps signal". Went back into GPSview and change everything back to what is was. Still "no gps signal".

Ok, so now it is time to walk away for a while before doing anything else. Closed down the GPSview, and, WHA LAA, I have a signal.

Went back into GPSview change the baud rate to 115200 at 5 repeats. Closed GPSview. Opened Copilot. No signal -> GPS settings -> change to 115200 -> click OK. Now the signal is coming thru just like it should.
tcassidy
Now you have to take it out for a test drive and see if you like updates every 5th of a second. Of course, CoPilot may just ignore the other 4.

Terry
Marvin Hlavac
Quote:
Closed down the GPSview, and, WHA LAA, I have a signal.
GPS receivers are normally capable of working only with a single GPS software at a time, so it is to be expected that while GPSview was running, CoPilot was unable to use your GM2. :-)

If you ever have a need to run two or more GPS applications simultaneously using a single GPS receiver, you may use a GPS signals splitter, such as GpsGate, for that purpose.
OneRVer
Quote:
Originally Posted by tcassidy
Now you have to take it out for a test drive and see if you like updates every 5th of a second. Of course, CoPilot may just ignore the other 4.

Terry
With the Bluetooth receiver, in a stand still situation, the elevation would jump around +- a couple of hundred feet. With the GM-2, baud rate 9600, repeat rate set at 2, the elevation would move +- three feet. Now with the GM-2, baud rate 115200, repeat rate set at 5, the elevation has been sitting at 2054 feet for the last couples of hours. No movement noticed at all.

I have not had a chance to take it out yet but so far so good.
tcassidy
Sorry, reading it 5 times a second doesn't make it more accurate. It has probably just stabilized on some reliable satellites.

Terry
Ken in Regina
Terry,

You're right that it's showing signs of more stability. That could be a direct result of using a higher sampling rate. It can more easily identify the outliers and throw them away.

...ken...
tcassidy
Sounds like a test for Mr Umbra!

Terry
OneRVer
I see these chart recording's that are posted here as thumb nails. Are they a part of the GPSview and if so how do you bring it up?
tcassidy
If you mean the ones MrUmbra so kindly provided, then no. Those are from his own program.

Terry
tcassidy
Quote:
Originally Posted by Ken in Regina
Terry,

You're right that it's showing signs of more stability. That could be a direct result of using a higher sampling rate. It can more easily identify the outliers and throw them away.

...ken...
I thought the MTK II chipset ran natively at 115200 bps. This would mean the ability to transmit at a lower bit rate and, probably lower refresh rate would be a function performed by ancilliary circuitry in the device. If that is the case, it could make decisions about the worthiness of its data without regard to the output.

Terry
OneRVer
Quote:
Originally Posted by tcassidy
I thought the MTK II chipset ran natively at 115200 bps. This would mean the ability to transmit at a lower bit rate and, probably lower refresh rate would be a function performed by ancilliary circuitry in the device. If that is the case, it could make decisions about the worthiness of its data without regard to the output.

Terry
I sure wish I understood what you just said.
tcassidy
I think the GPS chipset is running at the top speed to start with. It can make decisions about what is a good signal before it sends the data to whatever circuitry changes it to a user determined speed and refresh rate.

Neither GPS View nor most navigation software does post processing on that data. Therefore, regardless of the data rate or refresh rate you choose, there will be no improvement in the accuracy of the data received.

Or

The GPS data is as good as it will get before going through the the thing you control (refresh rate and bit rate).

Is that clearer?

Terry
OneRVer
10-4, Thank you.
tcassidy
However, the proof is in how it responds for you in real life. What it can do sitting on a table is no indicator to how you might like it in a real life situation, tooling down the road connected to your navigation software of choice.

You will let us know, right.

Terry
OneRVer
Quote:
Originally Posted by tcassidy
However, the proof is in how it responds for you in real life. What it can do sitting on a table is no indicator to how you might like it in a real life situation, tooling down the road connected to your navigation software of choice.

You will let us know, right.

Terry
Yep, that's a promise.
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