Click the little arrow beside the Help icon on the top toolbar.
Select "Help Topics"
Search for "csv"
Select the help subject "Importing Data".
You can do CSV files, among other things. But it looks like you can't do .EST files. So you would have to find a way to convert them to something Street Atlas will import. Check GPSBabel's online interface for conversion possibilities.
Thanks for the lead to GPSBabel. That is a nice package at an even better price.
As I usually work with standalone GPS for marine service, I have a very good code package for translating machine files. When I bought it, it didn't even know about the street navigator packages. I have kept it updated, and It does now (I just didn't know because I never looked). In fact it did a test file quite well, but I am still having trouble with the target file.
That package is called GPSUtility. There is a free/limited version, but because I used work with vessel GPS on a very regular basis, I bought a license years ago.
As to S&T, I'm going to try that again. Early in the year I loaded the new S&T on my only DOS machine and still didn't like. Knowing MacroSquash it will trash when I try to load and run it again and I will have to root out the markers that to old one left. I really want to get a look at the target file so I am sure the translation worked correctly.
I also want to run it because I have two client's that keep asking me questions about it. They are clients - after all.