| View previous topic :: View next topic |
| Author |
Message |
paul_and_kim
Lifetime Member
Joined: Dec 20, 2008
Posts: 6
|
 Posted: Fri Jan 02, 2009 6:03 pm Post subject: Navman S50 3D Speed Accuracy |
 |
|
Does anybody know how accurate the indicated speed is on this device?
It consistently reads less than my car speedometer in mph
Car - Navman
79 - 73
63 - 60
the difference is enough to gain points
any comments? |
|
| Back to top |
|
 |
mikealder
Pocket GPS Moderator
Joined: Jan 14, 2005
Posts: 19638
Location: Blackpool , Lancs
|
| Posted: Fri Jan 02, 2009 9:31 pm Post subject: |
|
|
| Welcome to the forum, the GPS speed will be more accurate than that displayed on your cars speedo - Mke |
|
| Back to top |
|
|
Gee-Pee
Lifetime Member
Joined: Feb 10, 2005
Posts: 1951
Location: Mostly somewhere in Essex
|
| Posted: Sat Jan 03, 2009 1:50 pm Post subject: Re: Navman S50 3D Speed Accuracy |
|
|
| paul_and_kim wrote: | Does anybody know how accurate the indicated speed is on this device?
It consistently reads less than my car speedometer in mph
Car - Navman
79 - 73
63 - 60
the difference is enough to gain points
any comments? |
I have generally found that the speed on one's speedometer is approximately 8% more (rounded up) than the speed displayed on the GPS device
i.e 30mph on GPS = 33 on speedometer; 50 = 54, 70 = 76 but it all depends upon individual vehicles and the age of the speedometer etc..
If you go over the GPS indicated speed/speed limit then you are certainly in trouble
_________________
Gee-Pee
Lifetime member PGPSW - time rapidly decreasing |
|
| Back to top |
|
|
paul_and_kim
Lifetime Member
Joined: Dec 20, 2008
Posts: 6
|
| Posted: Thu Jan 15, 2009 1:44 pm Post subject: Navman s50 3d acoeoed accuracy |
|
|
| Quote: | | I have generally found that the speed on one's speedometer is approximately 8% more (rounded up) than the speed displayed on the GPS device |
That would explain why it also underestimates the ETA, as if you are travelling at the speed limit on your speedometer you are actually going around 8% slower than you could be on that type of road. |
|
| Back to top |
|
|
Gee-Pee
Lifetime Member
Joined: Feb 10, 2005
Posts: 1951
Location: Mostly somewhere in Essex
|
| Posted: Thu Jan 15, 2009 2:18 pm Post subject: Re: Navman s50 3d acoeoed accuracy |
|
|
| paul_and_kim wrote: | | Quote: | | I have generally found that the speed on one's speedometer is approximately 8% more (rounded up) than the speed displayed on the GPS device |
That would explain why it also underestimates the ETA, as if you are travelling at the speed limit on your speedometer you are actually going around 8% slower than you could be on that type of road. |
Exactly! You will probably see that it adjusts the ETA the closer you get to your destination, so that you arrive consistent with the last ETA shown , not the one when you set out on your journey.
(your theory that the difference is enough to gain points on your licence is not true....it's the opposite. If your speedo is showing 75 you should actually be travelling at around 70 - as displayed on the satnav which is more accurate).
_________________
Gee-Pee
Lifetime member PGPSW - time rapidly decreasing |
|
| Back to top |
|
|
|
![]() Posted: Today Post subject: Pocket GPS Advertising |
|
|
We see you’re using an ad-blocker. We’re fine with that and won’t stop you visiting the site.
Have you considered making a donation towards website running costs?. Or you could disable your ad-blocker for this site. We think you’ll find our adverts are not overbearing!
|
|
| Back to top |
|
|
|
Forum FAQ
Search
Usergroups
Profile
Log in for private messages
Log in
