Garmin China NT

agbucks · Occasional Visitor Joined: Jan 29, 2007 Posts: 3

I will be travelling across China later this year with my Garmin Nuvi. I am thinking of buying a Garmin China map on an SD card.
I am aware that China 'offsets' its coordinates. Does this mean that a Garmin China map will be of any use or have they compensated for the offset in the mapping software?

M8TJT · Posted: Sat Apr 12, 2014 9:03 am Post subject:

Just makes me wonder how China 'offset the co-ordinates' of an American satellite system. Got a reference to how they do this?

cwog · Posted: Mon Apr 14, 2014 9:59 am Post subject:

Using a Google search based on
"GPS in China"
I came across this site

http://www.sinosplice.com/life/archives/2013/07/16/a-more-complete-ios-solution-to-the-china-gps-offset-problem

Whether this fully answers how they do the correction but it appears to be a software interpretation in the SatNav

However
YMMV

M8TJT · Posted: Mon Apr 14, 2014 10:38 am Post subject:

Thanks for the link. Interesting.
Ah, I see. They don't offset the GPS co-ordinates, but use a map with a different projection which leads to the errors between GPS position and Map position.

agbucks · Occasional Visitor Joined: Jan 29, 2007 Posts: 3

So do Garmin maps have this built in feature to ensure you in the correct place and not stuck in the middle of a river?

agbucks · Occasional Visitor Joined: Jan 29, 2007 Posts: 3

i managed to speak direct with Garmin who offered the following 'fix' in the event of a 'shift' in China:

Please follow the link below for the China position shifting article:

http://support.garmin.com/support/searchSupport/simpleCase.htm?caseId={4e0c7700-5f6c-11de-ff77-000000000000}&kbName=garmin

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