OP
@vcponsardin avatar
UTC

Hooked
2009 GTS 250ie
Joined: UTC
Posts: 273
Location: Urbana-Champaign, IL, USA
 
Hooked
@vcponsardin avatar
2009 GTS 250ie
Joined: UTC
Posts: 273
Location: Urbana-Champaign, IL, USA
UTC quote
A friend and I went out for a morning ride today with our new GPS devices. Guess what? As we were cruising along at the same speed on a nearby expressway, his was reading 53 mph, while mine was reading 55. Satellites... go figure.
@harvey avatar
UTC

Ossessionato
2016 Honda NC750XD, 2007 GTS (sold),
Joined: UTC
Posts: 3517
Location: Canada
 
Ossessionato
@harvey avatar
2016 Honda NC750XD, 2007 GTS (sold),
Joined: UTC
Posts: 3517
Location: Canada
UTC quote
Is your's Italian?
@mstevens avatar
UTC

Addicted
'05 LX 150 "Rosso Dragon"
Joined: UTC
Posts: 526
Location: New Hampshire
 
Addicted
@mstevens avatar
'05 LX 150 "Rosso Dragon"
Joined: UTC
Posts: 526
Location: New Hampshire
UTC quote
A couple of thoughts:

1) Think of what 2mph looks like. It's a crawl. It's entirely possible that when you think you're going "the same speed," you're actually a bit off.

2) I've ridden as a passenger while holding my wife's and my identical HTC phones with GPS running. With the units side-by-side on the dash so they were totally incapable of moving relative to each other, they occasionally showed different speeds. This was usually by 1mph, but sometimes by as much as 2.

Given that GPS gives positions accurate to within a few meters and that speeds are computed by comparing positions at different times, there is built-in error in terms of speed. For most purposes, 2mph is "close enough."

Moral of the story: don't bet your life on the absolute accuracy of GPS.
⚠️ Last edited by mstevens on UTC; edited 1 time
@aviator47 avatar
UTC

Moderator
2006 PX 150 & Malossi Kitted Malaguti Yesterday (Wife's)
Joined: UTC
Posts: 12955
Location: Paros Island, Greece
 
Moderator
@aviator47 avatar
2006 PX 150 & Malossi Kitted Malaguti Yesterday (Wife's)
Joined: UTC
Posts: 12955
Location: Paros Island, Greece
UTC quote
mstevens wrote:
Moral of the story: don't bet your life on the absolute accuracy of GPS.
Yup. Have seen many a boat run aground that way.
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