I talked to an installer last week because I wanted the GPS hook up installed. He said just using the 406-ELT, w/o the GPS function, will get ya located to within an area about as large as the Mulcahy Stadium. If you do have the GPS function active, you can be located to within an area about the size of a parking space at Mulcahy Stadium.
I sure thght the difference was much greater. So...for me it looks like the 406-ELT w/o the GPS function is good enough.
I have the ELT just gotta install it.
Maybe some of you CAP folk can comment on this.