Hi Henk!
This is what I have tried. I get a file with rows that look like:
23:19:51E|17:44:16.98S|%579
But s.surf.idw tells me "s.surf.idw: no data points found"
Same situation here (GRASS 5)! We will check it.
The next beta4 will have (at least) a working
s.surf.tps and s.surf.rst.
Volunteers welcome for further bugfixing!
Best regards
Markus Neteler