Note 3 GPS not easy to connect on trains

[juckera]

I have a Note 3 and use GPS and mapping app a lot while traveling, and it will be installed the huge mpj extended battery so that not be having to worry about making it through the day with my heavy GPS usage. It generally syncs itself just fine in most cases but I noticed it is difficult to get a connection on trains. Is that normal?

 

[humanfs]

I think metal is conflicting with the signal?