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Posted by Rod Speed on June 8, 2010, 2:20 pm


rick wrote:
>>> Last June I purchased a new 2009 Honda Odyessy Touring van. It
>>> comes with nearly every option one could wish for. One of the well
>>> used options is the Navigation system which I believe is built by
>>> Sony. It has a Day and Night screen setting as well as an
>>> "Automatic" setting which is to change the screen depending upon
>>> the amount of light outside. Early on, I noted that is would often
>>> NOT switch to night time display at the darkness grew. I could
>>> force it to go to the darker display, but the "Auto" setting would
>>> just turn it back to the lighter screen. This condition is now
>>> happening nearly all the time.
>>> Any ideas out there on how to fix this issue?
>> Two things were stated in replies.
>> One, are you sure it's not based on a time issue for your area as
>> was said, many units do it that way.
>> Two, it's under warranty, let them repair it before you screw it up
>> and void that warranty.
>> If it's truly a dark/light system, then there has to be a photo/light
>> sensor/controller located somewhere within the vehicle in order for
>> it to determine the difference. Therefore, that sensor could be the
>> problem. Otherwise, as another person stated, ensure it's not
>> activated by the vehicle headlight switch.
> I would check if the time zone is set properly for your area.

It cant be the time, its supposed to switch in tunnels etc.



Posted by Peter H. Coffin on June 9, 2010, 9:25 pm


On Wed, 9 Jun 2010 04:20:10 +1000, Rod Speed wrote:
> rick wrote:
>> I would check if the time zone is set properly for your area.
> It cant be the time, its supposed to switch in tunnels etc.

Geeze... how you gonna get a solid fix in a tunnel anyway?

--
64. I will see a competent psychiatrist and get cured of all extremely
unusual phobias and bizarre compulsive habits which could prove to
be a disadvantage.
        --Peter Anspach's list of things to do as an Evil Overlord

Posted by PeterD on June 10, 2010, 8:45 am


On Thu, 10 Jun 2010 01:25:03 GMT, "Peter H. Coffin"

>On Wed, 9 Jun 2010 04:20:10 +1000, Rod Speed wrote:
>> rick wrote:
>>> I would check if the time zone is set properly for your area.
>> It cant be the time, its supposed to switch in tunnels etc.
>Geeze... how you gonna get a solid fix in a tunnel anyway?


<bg> It's a Honda, won't it do everything?


Posted by Rod Speed on June 10, 2010, 2:23 pm


Peter H. Coffin wrote
> Rod Speed wrote
>> rick wrote

>>> I would check if the time zone is set properly for your area.

>> It cant be the time, its supposed to switch in tunnels etc.

> Geeze... how you gonna get a solid fix in a tunnel anyway?

You dont need to. The better GPS systems do an excellent
job of interpolating between solid fixes so what the user sees
doesnt change when there is a lack of solid fixes for while.

That works very well indeed with tunnels and
concrete canyons in the CBS of major cities etc.

Give a much better effect than just giving up when there is no solid fix
available.

It can still give you the usual turn by turn instructions as you are nearing the
end of the tunnel for what to do as you emerge from the tunnel so what the
user sees is seamless. Much better way of doing things than just stopping
giving the user the usual map display because it cant get a solid fix.

The better GPSs do have some mechanism to show the current set of
satellites that it can see etc.



Posted by SBH on June 10, 2010, 9:31 pm



> On Wed, 9 Jun 2010 04:20:10 +1000, Rod Speed wrote:
>> rick wrote:
>>> I would check if the time zone is set properly for your area.
>> It cant be the time, its supposed to switch in tunnels etc.
> Geeze... how you gonna get a solid fix in a tunnel anyway?
> --
Some GPS units have a feature called "Dead Reckoning" or perhaps another
name but the principle is the same. It uses the overall time/distance
equation to calculate the speed and keeps it on that path throughout a
tunnel and/or other satellite hindering objects until it receives a signal
once again. I've never had the opportunity to view the accuracy of that
feature.



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