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tsmccull
21 Posts |
 Posted - 19 oct. 2008 : 01:51:27
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Access by taping and holding elevation in sat screen[/center]
Anybody know what the SNR logging screen that you can get to from the satellite display in the 760 is for? |
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gpspassion
87843 Posts |
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poppap
73 Posts |
Posted - 19 oct. 2008 : 02:23:28
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I tried to find it and found that if you keep pressing the elevation you'll get into that screen.
I think it's for measuring how long it'll take for the unit to acquire the satellites.
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Edited by - poppap on 20 oct. 2008 09:45:16 |
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poppap
73 Posts |
Posted - 19 oct. 2008 : 02:46:12
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After testing further...
Nuvi 760 US w/ Sirf: TTFF = 00:39
Nuvi 765T US w/ MTK: TTFF = 00:55
Both unit placed at the same location, pressing the start button at the same time.
760 (Sirf) has faster Time-To-First-Fix, but seems like 765T (MTK) got stronger signal strength...
quote:
Carrier-to-Noise Power Density (C/N0). The ratio of the power level of a signal carrier to the noise power in a 1-Hz bandwidth. This is a key parameter in the analysis of GPS receiver performance. Nominal GPS receiver C/N0 values often are in the 40 to 50-dB-Hz range.
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Edited by - poppap on 19 oct. 2008 03:04:23 |
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tsmccull
21 Posts |
Posted - 19 oct. 2008 : 05:07:28
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| Yep, that's it. Just hold the elevation selection for a few seconds and those screens pop up. |
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gpspassion
87843 Posts |
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poppap
73 Posts |
Posted - 19 oct. 2008 : 12:55:37
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seems like only available in 7xx series...
I think "Eph" only show live ephemeris..
"Prdc" may be "Prediction"? |
Edited by - poppap on 19 oct. 2008 12:58:22 |
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gpspassion
87843 Posts |
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poppap
73 Posts |
Posted - 19 oct. 2008 : 15:07:58
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| I now think that "Prdc" stands for "Periodic" because it keep restarting warm start after it got the fix. |
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SergZak
USA
1618 Posts |
Posted - 19 oct. 2008 : 21:26:58
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Two questions:
1. What firmware version is this working on? 4.2? I am on 3.1 & 3.2 on two different units and this does not seem to work with firmware v3.x
2. Exactly how long are you pressing/holding the elevation data section to get to this screen? 10 seconds? 1 minute? |
nüvi 3790T, nüvi 765T, nüvi 855, nüvi 760, nüvi 750 |
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danham
USA
6379 Posts |
Posted - 19 oct. 2008 : 22:23:12
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With 4.2 on my 760 it takes about 4 seconds for the SNR screen to appear.
-dan |
- Nüvi forum moderator -
Nüvi 760 in a '10 Jetta TDI Diesel SportWagen & BMW F800 ST (350 & 680 stolen/recovered!)
Supporting a Vespa trek: >> details <<
Language Guide / US Topo / GPS III+ / MacBook with OS X & Win XP / Cape Cod, MA
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SergZak
USA
1618 Posts |
Posted - 19 oct. 2008 : 22:40:18
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| Thanks Dan. Seems as though this is a 4.x firmware feature since I simply cannot access it on my 3.x units...and I'm not ready to update to 4.2 any time soon either. |
nüvi 3790T, nüvi 765T, nüvi 855, nüvi 760, nüvi 750 |
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guggie
140 Posts |
Posted - 20 oct. 2008 : 00:35:50
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| Not on my Nuvi 760 either, at version 2.x |
Connecticut, USA
Garmin 760, aviation model GPS 90, and ETrex Vista HCx |
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poppap
73 Posts |
Posted - 20 oct. 2008 : 09:06:04
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I just notice that it create the file in the root of nuvi flash drive.. here is the sample..
I believe the format is
C/N0...,Accuracy,Lat,Lon,Elevation
edited: It's too long and changed the screen layout so I posted it here instead.
http://pastebin.com/f4686ddd3
my location was changed to xx.xxx and yy.yyy but you get the idea...
it doesn't seems to record the timestamp else we can use it as an exact tracklog recorder... |
Edited by - poppap on 20 oct. 2008 10:03:56 |
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tsmccull
21 Posts |
Posted - 20 oct. 2008 : 17:56:26
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| That's interesting. Since this seems to be a newly added function, I assume that Garmin has some future plan to make use of the data file. Given all the issues that have surfaced with the last several SW releases, it just seems counterproductive to add an additional capability to the system which is bound to take away some of those precious computer cycles while the programmers are trying to speed things up! |
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poppap
73 Posts |
Posted - 20 oct. 2008 : 22:41:54
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| Well.. it only create the file when you click "Start log" so I think it's for debugging purpose... don't know if it'll lead to any new functions.. |
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New hidden menu : SNR Log and TTFF on nuvi 7xx
