Reading Garmin .txt files

[routeconverter]

.txt for waypoints:
The text file can be imported in a spreadsheet. Which in some cases makes for easier editing. In any case, GPSBabel can read and convert these.

Which format do you use for GPSBabel to read the files?

.txt for tracks:
The .gdb file does not explicitly have a field for speed, the .txt file does. GPSBabel chokes on the date/ time format.

How about exporting to GPX?