Zumo 660 question

[Orange Spyder Man]

I noticed that my Zumo 660 GPS elevation is incorrect.... is there any way to update/zero/reset it ?

tia

OSM

[billybovine]

As far as I know there is not. Following is a quote from the Garmin FAQ section.

How accurate is the GPS elevation reading?


04/14/2014
GPS heights are based on an ellipsoid (a mathematical representation of the earth's shape), while USGS map elevations are based on a vertical datum tied to the geoid (or what is commonly called mean sea level). Basically, they are two different systems, although they have a relationship that has been modeled.


The main source of error has to do with the arrangement of the satellite configurations during fix determinations. The earth blocks out satellites needed to get a good quality vertical measurement. Once the vertical datum is taken into account, the accuracy permitted by geometry considerations remains less than that of horizontal positions. It is not uncommon for satellite heights to be off from map elevations by +/- 400 ft. Use these values with caution when navigating.

[Wiredux]

I'm not even sure why Garmin puts that in their GPS systems.

[Orange Spyder Man]

I'm not even sure why Garmin puts that in their GPS systems.

as inaccurate as my GSP elevation is.. I am not sure either

OSM

[BikerDoc]

As far as I know there is not. Following is a quote from the Garmin FAQ section.

How accurate is the GPS elevation reading?


04/14/2014
GPS heights are based on an ellipsoid (a mathematical representation of the earth's shape), while USGS map elevations are based on a vertical datum tied to the geoid (or what is commonly called mean sea level). Basically, they are two different systems, although they have a relationship that has been modeled.


The main source of error has to do with the arrangement of the satellite configurations during fix determinations. The earth blocks out satellites needed to get a good quality vertical measurement. Once the vertical datum is taken into account, the accuracy permitted by geometry considerations remains less than that of horizontal positions. It is not uncommon for satellite heights to be off from map elevations by +/- 400 ft. Use these values with caution when navigating.

Plus or minus 400 ft takes us here in Florida from over 350ft under water to over a 100 ft above our highest peak... guess that won't be much good for us...

[Pennyrick]

My wife and I both have '12 RT limiteds.

On a trip we have noticed that if my GPS says we are at 2,100 feet hers will read 2,085 or so. Her Garmin is always about 115-120 feet lower than mine.

[garb55]

My wife and I both have '12 RT limiteds.

On a trip we have noticed that if my GPS says we are at 2,100 feet hers will read 2,085 or so. Her Garmin is always about 115-120 feet lower than mine.

Yours must be mounted higher on the bike

[vided]

My wife and I both have '12 RT limiteds.

On a trip we have noticed that if my GPS says we are at 2,100 feet hers will read 2,085 or so. Her Garmin is always about 115-120 feet lower than mine.

Don't use her gps to land

https://m.youtube.com/watch?v=QkCQ_-Id8zI