Hi Tiago,

> The main idea of GPSMap is to easy access to helicorders around the world, but i can
> think in a solution for offline stations.
>
>
> I´m rebuilding GPSMap (i will announce here when the new version is launched), one of
> the new features i´m working on is a Time Travel "calculator"..but i have some doubts:
>
> 1) Which model should i use? IASP91, AK135, JB, other(?)? WinQuake suggests using
> different tables for teleseismic, local, regional events...

I believe that the ISAP91 model is newer then the JB tables so I would use it. I'm 
not sure about the AK135 (sounds like a gun ) model.

>
> 2) Many tables i´ve found only have some depths (ex: depth 0km 15km 35km 50km) and is
> related to one distance degree, how can i calculate the time travel for depth 8km at
> a distance of 40km (ex)?
>

The only thing you can do is interpolate between the two points in the table. Here is 
the C code used in WQ to do the interpolation;

double interpol(double x, double y, double a, double b, double point)
{
	return(a + ((point - x) * ((b - a) / (y - x))));
}

Hope this helps.

Regards,
Larry Cochrane
Webtronics
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