How is altitude computed/displayed?

Reason I ask is that I got a strange event on my iGo8 as the altitude display seems to have stopped at 443 feet elevation. There's no log being taped or replayed, just happened today. I'm at about 1,400 feet and it's still showing the height I was at in town.

Any ideas?

siberian

siberian wrote:Reason I ask is that I got a strange event on my iGo8 as the altitude display seems to have stopped at 443 feet elevation. There's no log being taped or replayed, just happened today. I'm at about 1,400 feet and it's still showing the height I was at in town.

Any ideas?

siberian

Just a guess but are you sure it's feet not in meters or whatever?

I did think of that, but given that the number does not change it wouldn't matter. But no, the speed is in mph, all other functions work (yes, even the little car :) ) but the altitude just went to 443 and stopped there even as I was going up the mountain.

Maybe I'll try and reset the system and see whether that does anything.

siberian

Elevation is totally inop. We're at around 1400 feet. This morning it showed 644 feet and stayed that way as I made my way down the mountain to check mail. I switched the unit off and restarted it to head back up, it now showed 0 feet.

ALL other functions work perfectly. Any ideas welcome!

siberian

OK having done some research and reading the manual, here is where I am at the moment.

1) I reset the system: No change

2) I checked satellite reception: 6 satellites of which 4 are at 100% and the other 2 at @60

3) Weird issue is the time. System time as displayed by the HU is correct. Time as displayed by iGo is incorrect. I reset once again the Time Zone from Central Europe to my zone and the display is now correct including elevation at 1373 feet.

4) I choose another car from the Library and thus have to restart iGo. System time is correct; iGo time is once again to Central Europe time, elevation is zero feet.

5) I try and force determine time zone from satellite it says "unable to do so, do you want to set manually?". I do and reset it again to my time zone from central Europe. Again display of time zone in iGo is correct including elevation. I did not specify GPS time correction.

It's just not keeping local time which is somehow affecting the elevation for some reason. As far as the manual I have, it states that a minimum of 4 satellites need to be present to determine elevation. This has been met.

Next, speed, topology, etc. all function. As soon as I turn the unit on or restart iGo by having chosen for example a new car or simply switched the vehicle off and return to it later, the time zone is back to Central Europe and elevation is gone. Current maps/POI loaded: Alaska, Canada, Washington and Oregon.

ANY help would be welcome about now :)

siberian

Is there any parameter that could be checked that would invalidate elevation???

siberian

I have several devices running the same build of igo primo and not one of them agree on altitude, have you manually selected the timezone within igo? Because I noticed it doesn't change the system timezone when set to automatic, maybe both system and igo's timezone need to be set for it to stick?

Thanx for that. After numerous tries here is some further data on this:

1) I run the same version and build of iGo on a Maisun and Keenlu unit. The former on WinCE5 and the latter on WinCE6

2) There are NO problems on the Maisun with elevation other than the iGo time keeps drifting back to Beijing or whatever time. Resetting it normally works for a few days, system time is OK.

3) The only difference between the two is that on the wife's car she has the default car I have one from the library.

4) Resetting mine to the default car has no effect on elevation

4) Elevation: Two scenarios

a) It either shows ZERO FEET or

b) Just as often will show INITIAL elevation (as a snapshot) and then stay frozen at that setting for the remainder of the trip.

To answer your question. iGo will NOT accept on either unit setting time to "automatic". It simply says "unable to calculate time from satellite. Do you wish to set manually?". This was true from the previous version of iGo to this one and is present on both the Maisun and the Keenlu unit.

Since elevation works on the Maisun unit I was wondering, even though I've gone over the parameters a few times in both units, if there was any way I could opt for one variable (like... "Enable Navigation in 2D") that would cause my unit to either freeze at startup elevation or simply display ZERO feet.

I was going as a last try, to reload the previous version of iGo8.3 since I didn't have a problem with it then. But since it works OK on the Maisun... I'm out of ideas.

Thank you for any help

siberian

PS System time on the Keenlu unit is rock solid. Set to AK time and is consistently on track and matches the vehicle clock.

As you're using the same build of iGO on both devices and one works and the other doesn't, it must be a hardware issue, not all gps devices send data the same, some cache data in a buffer and send it in chunks and some send it direct, depending on the original software's requirements, it may be that igo doesn't interpret it correctly and is failing to display correctly, there is more than 200 ft difference between my devices all running the same build of primo 2.0, you can turn off the altitude display or replace it with another value if you prefer

So there is no parameter that I could have set inadvertently that would cause this.

you can turn off the altitude display or replace it with another value if you prefer

Can you tell me how to turn it off? I wonder if I toggle this switch it may force it to come "alive"?

TIA

siberian

I don't have a device with iGO 8 installed to hand but somewhere in the menu there is cockpit settings where you can change the displayed data, tap and hold may achieve the same thing.

Great, I'll try that! Thank you

siberian