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 GPS vs indicated speed

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scootingranny
GaryL
Opalsboy
tarmacburner2
kbcmdba
The Scootist
honda_silver
robert
joncallihan
Hammy
exavid
crahar
MaxB
trouble1100
jdeereanton
Waspie
MikeO
bkg123
dspevack
compguy
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honda_silver
Silver Wing Guru
Silver Wing Guru
honda_silver


Number of posts : 2453
Location : Georgetown, Tx
Points : 7503
Registration date : 2008-12-23

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeFri Oct 29, 2010 3:59 pm

Waspie wrote:
At that speed - who cares!! Twisted Evil I'd be too busy just hangin' on. Shocked Laughing Laughing Laughing

rolling laughter
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dspevack
Silver Wing Guru
Silver Wing Guru
dspevack


Number of posts : 2008
Age : 57
Location : Miami, FL
Points : 7342
Registration date : 2008-12-27

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeFri Oct 29, 2010 7:47 pm

Waspie wrote:
honda_silver wrote:
Waspie wrote:
Silverwing with JATO bottles and afterburners fully on!!! Smile Twisted Evil Twisted Evil = What a Face

Would the GPS display the correct MPH? Twisted Evil

At that speed - who cares!! Twisted Evil I'd be too busy just hangin' on. Shocked Laughing Laughing Laughing

In this situation wouldn't the GPS be measuring ground speed
when it should be measuring air speed?
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compguy
Scooter Rider
Scooter Rider
compguy


Number of posts : 98
Age : 75
Location : Winter Haven, Fla
Points : 4452
Registration date : 2010-10-11

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PostSubject: Speedometer acturate?   GPS vs indicated speed - Page 2 I_icon_minitimeSun Jun 05, 2011 6:03 pm

I've touched on this before but can't seem to find it when I search for it.

When I bought my 2010 Silverwing in October of last year I measured the speedometer to if it was off the usual 10% or so. I found by doing several checks that it was acturate and not off again. I've riden 12,000 miles since then.

Well today a friend of mine bought a new Victory mc, and I think he said it was a 1800 cc. He wanted to check his speedometer and wanted me to ride side by side for a 2 mile stretch to see how it did compared to mine. Well we took off and when the run ended and I pulled up beside him he was thrilled that we were running neck to neck at 100 mph, only I didn't have the guts to bust his bubble and tell him mine was only indicating 88 mph.

Keith
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exavid
Silver Wing Guru
Silver Wing Guru



Number of posts : 2658
Age : 79
Location : Medford, Oregon
Points : 7529
Registration date : 2009-07-17

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeSun Jun 05, 2011 10:03 pm

Seems it would have been better to do what he asked for and give him an honest answer.
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kbcmdba
Maxi-Scooter Rider
Maxi-Scooter Rider
kbcmdba


Number of posts : 176
Location : Illinois, US
Points : 4277
Registration date : 2011-05-05

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeMon Jun 06, 2011 3:13 am

dspevack wrote:
Waspie wrote:
honda_silver wrote:
Waspie wrote:
Silverwing with JATO bottles and afterburners fully on!!! Smile Twisted Evil Twisted Evil = What a Face

Would the GPS display the correct MPH? Twisted Evil

At that speed - who cares!! Twisted Evil I'd be too busy just hangin' on. Shocked Laughing Laughing Laughing

In this situation wouldn't the GPS be measuring ground speed
when it should be measuring air speed?

You are correct though with such a low glide ratio, I'm not sure it would mattter much... affraid
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tarmacburner2
Silver Wing Guru
Silver Wing Guru
tarmacburner2


Number of posts : 1099
Age : 68
Location : Cleveleys, Lancashire, England
Points : 5665
Registration date : 2010-03-27

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeMon Jun 06, 2011 2:46 pm

Just to throw another spanner in the works!

Off to France next week so needed some means of having kph displayed (the kilometer speed markings on the speedo are poor to say the least).
Solution was to fit a bicycle computer. Measured the distance each revolution of the front wheel travelled and hey presto a speed reading that is accurate to 0.1 of a kilometer, so hopefully no fines from the French gendarmes.
Cheers,
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compguy
Scooter Rider
Scooter Rider
compguy


Number of posts : 98
Age : 75
Location : Winter Haven, Fla
Points : 4452
Registration date : 2010-10-11

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 8:58 am

exavid wrote:
Seems it would have been better to do what he asked for and give him an honest answer.
Not in this case. Right now he really isn't into riding and if I told him his mc was not telling him the truth he might give it up altogether. After all his mc was telling him he was going 100 so to most people that would be truth. So far if he rides 50 miles in a year that's good enough.

Keith
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Guest
Guest




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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 9:46 am

When I first got my Swing and hadn't put the GPS on it yet I drove down 55mph roads and people would tailgate me and pass me and I wondered why everyone was driving like a maniac that day.

When I learned that I was actually driving 49-50, things started to make sense.
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Opalsboy
Silver Wing Guru
Silver Wing Guru
Opalsboy


Number of posts : 1288
Age : 77
Location : Rison, Arkansas
Points : 6402
Registration date : 2009-01-10

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 2:08 pm

Rumor has it that Honda builds in a 10% speedo difference. That would equate to 55 - 5.5 = 49.5 mpg. An interesting discovery I have made with the trike kit... I am actually going 2 to 3 mph faster than the speedo shows now. I have adjusted my driving habit to reflect that discovery.
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MikeO
Site Admin
MikeO


Number of posts : 3649
Age : 73
Location : Seaham, Co Durham, UK
Points : 8639
Registration date : 2009-06-29

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 2:31 pm

I think that's common here; our VW is roughly 10% over (or under?) to assist drivers to stay under the speed-limits.
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Waspie
Silver Wing Guru
Silver Wing Guru
Waspie


Number of posts : 2392
Age : 70
Location : Portland, UK
Points : 7279
Registration date : 2009-07-26

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 4:24 pm

kbcmdba wrote:
dspevack wrote:
Waspie wrote:
honda_silver wrote:
Waspie wrote:
Silverwing with JATO bottles and afterburners fully on!!! Smile Twisted Evil Twisted Evil = What a Face

Would the GPS display the correct MPH? Twisted Evil

At that speed - who cares!! Twisted Evil I'd be too busy just hangin' on. Shocked Laughing Laughing Laughing

In this situation wouldn't the GPS be measuring ground speed
when it should be measuring air speed?

You are correct though with such a low glide ratio, I'm not sure it would mattter much... affraid

So would that be 'true', 'rectified' or 'indicated airspeed.'

Either way my original response still applies!! " Who cares" Twisted Evil affraid
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joncallihan
Silver Wing Guru
Silver Wing Guru



Number of posts : 1025
Age : 84
Location : Lafayette, Colorado, USA
Points : 6063
Registration date : 2009-02-16

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 4:35 pm

Right on Doug! alien beamed up
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GaryL
Super Scooter Rider
Super Scooter Rider
GaryL


Number of posts : 237
Age : 70
Location : Casa Grande, Arizona
Points : 4639
Registration date : 2010-07-09

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 4:37 pm

You left out Mach number.... affraid
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MaxB
Touring Scooter Rider
Touring Scooter Rider
MaxB


Number of posts : 302
Age : 70
Location : Indiana
Points : 5017
Registration date : 2009-10-06

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 6:45 pm

YA know, I was just thinking.

When i ride I keep up with traffic and rarely look at the speedo.

I know its off by GPS.
The group I ride with some know their speedo is off and adjust accordingly. Others in the group say we ae speeding and slow down.
Last summer I got on the CB and would call out the speed of the GPS and have them look at their speedos at that time.

Some still said how do you know the GPS is right? I said that is is more accurate that all the speedos, since it was accurate to within 12 ft. So at 60 mph it could be off by .05%.

So now when traveling the lead calls out for speed reference and I tell him.
Everyone then knows we are at the true speed limit.

When alone I do what traffic does or a little faster.

All things are relevant to the moment. I find that rock and roll is for faster speeds and ballads/love songs are for toodling down country lanes.

MaxB (who really doesnt care what the speedo says)
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MaxB
Touring Scooter Rider
Touring Scooter Rider
MaxB


Number of posts : 302
Age : 70
Location : Indiana
Points : 5017
Registration date : 2009-10-06

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 6:47 pm

Isn't air speed given in knots?????

I don't think my GPS has that setting.

I did knots in boy scouts long ago.

just saying.

MaxB
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dspevack
Silver Wing Guru
Silver Wing Guru
dspevack


Number of posts : 2008
Age : 57
Location : Miami, FL
Points : 7342
Registration date : 2008-12-27

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 07, 2011 6:58 pm

The only important thing about a speedo, is that I'm not wearing one.

Dan
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kbcmdba
Maxi-Scooter Rider
Maxi-Scooter Rider
kbcmdba


Number of posts : 176
Location : Illinois, US
Points : 4277
Registration date : 2011-05-05

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeThu Jun 09, 2011 7:13 pm

Another bit of gas to add to the fire...

Because speed is computed based on a set radius of the tire, it is expected that indicated speed will change as tire temperature changes because the change in temperature will change air pressure and as a result, change the circumference of the tire. While this change may not be significant (unless your tire is grossly under-inflated), it does make a difference as speed goes higher. The only way to truly tell speed is to compare to an object is to compare it relative to something deemed stationary. We consider the ground to be stationary usually (except maybe in earthquakes).

All in all, however, if I get pulled over, I'm sure I'm likely to tell the officer that I am just trying to be safe keeping up with the traffic around me. It's one of those catch-22's. You can be arrested for speeding or you can be arrested for impeding traffic. Which is safer for the biker? You decide.

I generally don't care what my speedo says at that time (within reason) because speed doesn't kill. Difference in speed is what kills (for our NASA folk, it's not velocity that kills, it's delta-velocity that kills...) :-). Of course, delta-v (speed) relative to the ground gets higher as the speedo indicates faster whether or not it's accurate.

Skydivers and base jumpers all understand this: "Jumping off the (tall structure) doesn't kill. It's a sudden stop at the end that could kill you. Check your parachutes!"

Maybe I should start wearing a parachute in case I see an impending crash... :-) Yeah - that's it - put an ejection seat on my SWing :-)
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kbcmdba
Maxi-Scooter Rider
Maxi-Scooter Rider
kbcmdba


Number of posts : 176
Location : Illinois, US
Points : 4277
Registration date : 2011-05-05

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeThu Jun 09, 2011 7:17 pm

... :-)

If I put an ejection seat on my SWing, I'll also put a bumper sticker on it...

"In event of crash, this vehicle will no longer be occupied."
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scootingranny
Scooter Rider
Scooter Rider



Number of posts : 21
Points : 4157
Registration date : 2011-03-15

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeFri Jun 24, 2011 8:01 pm

DH said that every Honda he's ever owned showed approximately 5 mph faster than actual highway speed (considering 55-60 as "normal" highway speed) which would be approximately 10%. He put the GPS on mine and it was exactly that. Explains why I wasn't pulled over the other day by a policeman doing radar from a side street as I doing 46 in a 40 mph zone--per a later GPS run, I was actually doing about 42 and that probably wasn't worth the effort to pull me over (thank goodness). I mentally make note of that 10% and as another response indicates...explains why some guy was tailgating me across a bridge where the speed limit was 40 and I was going 42...was actually going about 36-38
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AAAA
Silver Wing Rider
Silver Wing Rider



Number of posts : 442
Points : 4781
Registration date : 2010-11-14

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeFri Jun 24, 2011 10:23 pm

Waspie wrote:
kbcmdba wrote:
dspevack wrote:
Waspie wrote:
honda_silver wrote:
Waspie wrote:
Silverwing with JATO bottles and afterburners fully on!!! Smile Twisted Evil Twisted Evil = What a Face

Would the GPS display the correct MPH? Twisted Evil

At that speed - who cares!! Twisted Evil I'd be too busy just hangin' on. Shocked Laughing Laughing Laughing

In this situation wouldn't the GPS be measuring ground speed
when it should be measuring air speed?

You are correct though with such a low glide ratio, I'm not sure it would mattter much... affraid

So would that be 'true', 'rectified' or 'indicated airspeed.'

Either way my original response still applies!! " Who cares" Twisted Evil affraid

+1
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AAAA
Silver Wing Rider
Silver Wing Rider



Number of posts : 442
Points : 4781
Registration date : 2010-11-14

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeFri Jun 24, 2011 10:23 pm

They make speedo healers, but like Waspie said . . . . . . .
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Waspie
Silver Wing Guru
Silver Wing Guru
Waspie


Number of posts : 2392
Age : 70
Location : Portland, UK
Points : 7279
Registration date : 2009-07-26

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeSat Jun 25, 2011 3:11 am

scootingranny wrote:
DH said that every Honda he's ever owned showed approximately 5 mph faster than actual highway speed (considering 55-60 as "normal" highway speed) which would be approximately 10%. He put the GPS on mine and it was exactly that. Explains why I wasn't pulled over the other day by a policeman doing radar from a side street as I doing 46 in a 40 mph zone--per a later GPS run, I was actually doing about 42 and that probably wasn't worth the effort to pull me over (thank goodness). I mentally make note of that 10% and as another response indicates...explains why some guy was tailgating me across a bridge where the speed limit was 40 and I was going 42...was actually going about 36-38

Here in the UK the police, (real walking - talking police officers,) have a little bit of discretion over when the 'pull' you for a speeding offence.

They 'normally' use the speed limit add 10% for guage error and add a further 2 mph to that figure, however add to that bad day and you may not get the same response!!!!

So;

If the speed limit was 70 mph, add 10% (7mph) = 77 mph then add a further 2 mph giving a total of 79 mph before they would pull you over. (On a good day!!)

There is also the road side so called 'Safety Camera' vans. They have no lee way at all. If the speed limit is 30 mph and you do 31 you will receive a ticket through the post!
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Meldrew
Visiting Curmudgeon
Meldrew


Number of posts : 3983
Location : York, North Yorkshire, England UK
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Registration date : 2010-11-16

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeSat Jun 25, 2011 4:24 am

In bright sunlight it's hard enough to see the map on my GPS so I'm not going to take my eyes off the road to peer down at the screen at a tiny MPH display to see if it matches the speedometer.

Just think after all the posts about wearing hi-viz gear if you got clattered by a car because you were too busy squinting down at your sat nav screen.
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compguy
Scooter Rider
Scooter Rider
compguy


Number of posts : 98
Age : 75
Location : Winter Haven, Fla
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Registration date : 2010-10-11

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 28, 2011 6:34 pm

After over 12,000 miles a recheck confirms that my speedometer is accurate.


Last edited by compguy on Wed Jun 29, 2011 1:21 pm; edited 1 time in total
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Meldrew
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Meldrew


Number of posts : 3983
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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeTue Jun 28, 2011 6:40 pm

compguy wrote:
After over 12,000 miles a recheck confirms that my speedometer is acturate.

Unlike your spelling of accurate! Smile
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compguy
Scooter Rider
Scooter Rider
compguy


Number of posts : 98
Age : 75
Location : Winter Haven, Fla
Points : 4452
Registration date : 2010-10-11

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeWed Jun 29, 2011 1:22 pm

Meldrew wrote:
compguy wrote:
After over 12,000 miles a recheck confirms that my speedometer is acturate.

Unlike your spelling of accurate! Smile
Thanks
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mrcaveman
Scooter Rider
Scooter Rider



Number of posts : 19
Age : 76
Location : Springfield, Il
Points : 4008
Registration date : 2011-08-11

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeMon Aug 15, 2011 9:09 am

I just purchased a new 2011 Swing. I have to agree with Compguy about GPS speeds. My Swing is dead on with my GPS at any speed.... My 07 VTX1300R is not. It is off by what most of you experence. Example: On the X at 35 mph the gps is reads only 30. AT 40 the gps is only 35 etc. To cruse at 65 mph on my VTX I have to go 72 mph indicated. The new Swings just may be dead on. To cruse at 65 mph on the swing I travel at 65 indicated. Just my 2 cents. The most important thing , its a great ride no mater the speed you travel at. Have a wonderful day.
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midlandchip
Scooter Rider
Scooter Rider
midlandchip


Number of posts : 79
Age : 84
Location : Midland, Michigan USA
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Registration date : 2010-11-21

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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeSat Aug 20, 2011 11:52 pm

My GPS also reads lower than my speedometer. It's close to a 10% difference but it's no big deal.
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Guest
Guest




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PostSubject: Re: GPS vs indicated speed   GPS vs indicated speed - Page 2 I_icon_minitimeMon Aug 22, 2011 9:40 pm

just sing louder !!!!!!!!!!!!




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