andnav, gps and maptiles...

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What is the proper maptile format so that andnav2 can read the tiles? For some reason, my copy of andnav2 can read google maps, etc just fine but not yahoo map tiles created in trekbuddy. I'm definitely saving the tiles in andnav format in both cases. However, the yahoo tiles save as XX.jpg.andnav and the google tiles save as xx.png.andnav. Does andnav only recognize png? Even when I have the tiles set to save as png in the layers settings in trekbuddy, the yahoo maps still don't display or even appear to save as png. I got it to work once (I swear) but I don't recall how. Any advice? Perhaps there is an alternative to andnav I can use for offline map browsing and gps tracking? I don't need the turn by turn features, just the ability to view a map and my gps position on said map and I prefer yahoo maps because they take up way less space than google. There must be something I'm missing or don't understand about doing this.

I did post this on the andnav forum some time ago but that place is as active as a country road in winter.