NAV Question
Thread Starter
Instructor
Joined: Apr 2013
Posts: 183
Likes: 1
From: Reno NV
NAV Question
I haven't seen this problem so I thought I would post it and see if anybody else has had it.
I just picked up my c7 on 4/23 and we drove from Maryland to Nevada. On several occasions I noticed that the speed limit showing on the info screen was different than the posted speed limit. We had this happen multiple times and in multiple states. I was wondering if my map needs to be updated?
I just picked up my c7 on 4/23 and we drove from Maryland to Nevada. On several occasions I noticed that the speed limit showing on the info screen was different than the posted speed limit. We had this happen multiple times and in multiple states. I was wondering if my map needs to be updated?
Le Mans Master
Joined: Feb 1999
Posts: 5,353
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From: And then it was said... "let there be blue Corvettes and yellow Camaros" Ft Worth Texas
Cruise-In IV Veteran
St. Jude Donor '09
I think he is talking about the speed limit sign that can be viewed on the DIC. I have noticed that also, guess the software will always lag behind the actual highway speeds posted as they get changed up or down.
Thread Starter
Instructor
Joined: Apr 2013
Posts: 183
Likes: 1
From: Reno NV
Sorry for being unclear. Blue Demon is correct. I was referring to the speed posted on the DIC. It was off by 10+ mph on several occasions. I just assumed that it was tied in to the same information as the nav system. Apparently not.
Race Director
Joined: Feb 2014
Posts: 12,243
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From: Center of the Universe, Alabama
I've noticed very accurately located accident icons on the nav screen for the road I'm on. I assume that's from OnStar. Possibly speed limit info comes from OnStar too?
Race Director
Joined: May 2008
Posts: 10,742
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From: Manheim Pennsylvania
. Speed limit info is from the data base. Virtually impossible to be totally accurate, speed limit signs seem to change at random. It is not just GM's system either. Useless information, I never look at displayed speed information.
Race Director
Joined: Mar 2005
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From: La Center WA
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From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
I view the supposed posted limit in Tour Mode all the time...
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From: La Center WA
Melting Slicks
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From: SE VA VA
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Melting Slicks
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From: SE VA VA
Pro
Joined: Sep 2000
Posts: 693
Likes: 17
From: San Leandro California
Question for the speed limit that's posted on the DIC. For some reason, it doesn't always show what the posted speed limit is. Lots of times it's blank and I'm on major streets here in CA. Any suggestions on to why this is happening?
Thanks Jerry
Thanks Jerry
Last edited by Lyons16; Dec 15, 2015 at 04:17 PM.
Le Mans Master
Joined: Sep 2012
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From: Hagerstown MD
St. Jude Donor '15-'16,'18
Pretty sure it's normal. Same thing in my area. PA turnpike recently raised speed limit to 70 but DIC still shows 65. Some streets I drive show nothing on the DIC.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
I notice the same with my Garmins. The city/county/state changes the speed limit on a section of road, and the change isn't reported to the company that makes the maps.
I also notice that I don't get a posted speed limit on my Garmins in the city if I'm driving on a side street that does not have posted speed limit signs but the speed limit is specified by the city's speed limit that is the default limit unless otherwise specified.
I also notice that I don't get a posted speed limit on my Garmins in the city if I'm driving on a side street that does not have posted speed limit signs but the speed limit is specified by the city's speed limit that is the default limit unless otherwise specified.
Last edited by JoesC5; Dec 15, 2015 at 04:44 PM.
Safety Car
Joined: Jul 2011
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From: Phoenix, Arizona
I find it very useful when you're on some country road and come into a town where the cops are waiting to catch you speeding and you don't see any speed limit sign. I find it on DIC and know what speed is legal here.
Safety Car
Joined: Jul 2011
Posts: 4,496
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From: Phoenix, Arizona
I've always thought it's simply because the database they are using doesn't have an entry for the speed limit on this road in this area.