Here is the file that @isg talking about
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1.) Extract rar from above link
2.) Rename in .System your GPS folder to GPS1
3.) Add GPS folder from step1 on your nuvi in .System folder
4.) Go outside, whait for satellite lock and make procedure for satellite accuracy again
5.) If all go Ok, you will have 3m - 5m accuracy
This is from EU nuvi 37xx --> 34xx with 3m accuracy beside my window i didn't test it on road, but this file test @isg
p.s.
@isg
Thank you for your time and test and for your review
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