Map Speed Correction wrong?

MARViN2003 · Posted: Tue Jan 13, 2009 5:21 pm Post subject: Map Speed Correction wrong?

Hello all,

The roads near where I work have had their speed limit changed to 20 mph.

I've use the map corrections to change the sections of road (setting them to 20 mph) but now when I drive along them the tomtom display shows 15/19

Do you have to set the speed to 1mph above the limit to get it to show correctly?

GerryC · Posted: Tue Jan 13, 2009 5:25 pm Post subject:

This is due to a rounding error as the mapshare changes appear to be saved in km/h then converted. Some end up correct by chance while others are 1mph out.

Apparently, the Dutch TomTom company don't see it as a big problem as "it only affects the UK". When they get more American reports, they may do something. Evil or Very Mad

_________________
Gerry
TomTom730T
Cameralert for Android
Brodit ProClip mount

DennisN · Posted: Tue Jan 13, 2009 6:44 pm Post subject:

Why doesn't somebody tell them it's quite simple - just divide by five, multiply by nine and add 32. What's complicated about that?
_________________
Dennis

If it tastes good - it's fattening.

Two of them are obesiting!!

Tim Buxton · Posted: Tue Jan 13, 2009 7:04 pm Post subject:

Tim Buxton · Posted: Tue Jan 13, 2009 7:19 pm Post subject:

Steveee · Posted: Wed Jan 14, 2009 12:08 am Post subject:

I actually prefer it to be slightly out! At least I can see that the speed limit is as a result of a correction. Razz

_________________
Steveee
Where am I?
==============
GO 920 (retired)
Garmin Oregon 550T
Garmin Drivesmart

Daggers · Posted: Wed Jan 14, 2009 12:52 am Post subject:

Hasn't this been corrected in v8.3? I certainly haven't seen any 29mph roads for a while, and the one obscure road that I updated via Mapshare is definitely showing 30mph.

DennisN · Posted: Wed Jan 14, 2009 1:01 am Post subject:

I've just corrected my street to 30mph and it shows 31mph. That's GO920, App 8.300, map 815.

On the other hand, my GO720 on which I performed the same test, now shows 29mph - App 8.010, Map 810.
_________________
Dennis

If it tastes good - it's fattening.

Two of them are obesiting!!

GPS_fan · Posted: Wed Jan 14, 2009 1:51 am Post subject:

At least, when you've got them both side by side on your windscreen, you know the truth is somewhere in the middle Rolling Eyes

...and I'm guessing that you're of the generation whose powers of mental arithmetic can figure it out on the fly without the assistance of a calculator Wink

_________________
Andy
PocketGPSWorld.com supports Help for Heroes - Read here

Andy_P · Posted: Wed Jan 14, 2009 2:42 am Post subject:

Reminds me of my old boss who had his own private plane.

He never felt he could trust his altimeter, so eventually fitted another.

Of course they then gave different results... so he had to fit a third one in the hope that two of them might agree....

You can see where this is going can't you? Wink

DennisN · Posted: Wed Jan 14, 2009 11:37 am Post subject:

Mick_1959 · Posted: Wed Jan 14, 2009 11:53 am Post subject:

So do all devices now agree what speed you are doing Very Happy

_________________
Mick
Go 1005 in need of resuscitation
GO 950 Dead,
GO 920 Dead

DennisN · Posted: Wed Jan 14, 2009 12:04 pm Post subject:

andy-c1 · Posted: Wed Jan 14, 2009 12:53 pm Post subject:

DennisN · Posted: Wed Jan 14, 2009 8:53 pm Post subject:

Of course! They all shout encouragement - "Cross the roundabout, second exit", "Go left on the roundabout, second exit", "At the end of the road, take the second left", "Turn around when possible". That should get me out of our street, shouldn't it? The 720 occasionally speaks in tongues - grandchildren's tongues "Wake up Dennis, Speed Camera/Mobile Camera/Camera Removal check ahead!"
_________________
Dennis

If it tastes good - it's fattening.

Two of them are obesiting!!

	PocketGPS
	Web