ADVrider how does a GPS measure distance?
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 08-02-2005, 04:44 AM #1 RoyB OP Dartmouth, Massacusetts   Joined: Aug 2004 Location: Dartmouth, MA Oddometer: 1,578 how does a GPS measure distance? over a long trip, how does a gps measure distance? point to point and then adding it all up or as the crow flies? __________________ Roy B Dartmouth, MA www.rvbprecision.com 2007 BMW K1200R Sport abs,2007 DL650 V Strom abs 2004 Honda VFR abs,2001 Moto Guzzi Rosso Mandello 1971 Honda Trail CT90
 08-02-2005, 04:48 AM #2 Kaumajet H.I.D. Positive     Joined: Jun 2003 Location: Ottawa Oddometer: 10,137 Assuming you have an auto-routing GPS, or one that will navigate roadways - if you're in Automobile mode, the GPS will calculate the distance along a route determined by your criteria (shortest route, fastest route, avoid this or that). The distance it comes up with will be the actual distance along the roadway. In marine or other modes, depending on the GPS, the distance wil be straight line, without slope correction. __________________ "I understand the dilemma. Correct spelling takes time that could be spent licking the windows on the short bus." mac62 "There is just something special about a stripper with a tail" ilmostro
 08-02-2005, 06:46 AM #3 Jabba "HOLD THE LIGHT!!!"     Joined: Nov 2002 Location: Just east of the Pine Beatle- Evergreen, CO Oddometer: 12,559 Huh- I was gonna go with "triangulation, knucklehead". __________________ "Everybody loves cunnilingus!" Chacifer "The road to paradise is paradise" Jacques Yves Cousteau
 08-02-2005, 08:05 AM #4 reinerka Gnarly Adventurer   Joined: Oct 2004 Oddometer: 350 A GPS will take a position every second (or 5 seconds for some older units) and then calculate the distance between the two measurements. For the trip odometer of the GPS it will simply add those distances up to compute the total miles (or kilometers) traveled. The distance includes changes in altitude as well if you have enough satellites (3D Navigation). If your GPS does have track logs (typically for back tracking a route) those will not match the odometer (in most cases) since they "smoothen" out the number of points and will come up with a more straightline approach. This will result in slightly smaller distance numbers. Found this when comparing a longer trip with lots of twisty roads and comparing the total of the GPS odometer with the individual track logs (differed by about 3% - still better than the bike odometer). Reiner __________________ ---------------------------------------- '09 R1200GSA '09 F800GS '05 KLR650
 08-02-2005, 10:50 AM #5 Infracaninophile Finding My Way..     Joined: Sep 2001 Location: New England, USA Oddometer: 7,515 Geometry. Edit: Now that I think about it, it must be Trig, not geometry. Math is hard. T. Infracaninophile screwed with this post 08-02-2005 at 03:15 PM
 08-02-2005, 11:34 AM #6 FatChance Road Captain     Joined: Jun 2003 Location: Durango, Colorado, USA Oddometer: 10,497 Math is hard. __________________ Pain in the Butte Ranch Durango, Colorado - Calculated risk or forbidden fruit?
 08-02-2005, 04:26 PM #7 jktpa X-Troller     Joined: Jun 2002 Location: Orlando/Blairsville Oddometer: 785 By Fucking Magic __________________ Knick Low Tech-Hi Fun F800GS WR250R ET4

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