Hi aspirin

I know about the images and how to get them and put them in Garmin. I've hacked my firmware and my Garmin will display any jnx file I put in it. My question is: given identical satellite views which format provides the best view when looking at the screen. Is one sharper than the other, etc? jnx is faster than img, right? what about compared to kmz? Is jnx better for larger areas than kmz? And if so, at what point?

The jnx files I create from Google Satellite are better resolution than the ones downloaded from Garmin. Although lately, for my area, it seems that the ones from Birdseye subscription are more recent these days.

I've been using my Oregon for hiking for several years. I've always created kmz files for custom maps (calibrating them manually), but now that i can create jnx or img files just as easily (or easier) using apps like SASPlanet or mapc2 which format provides the best screen view while on the trail?

Thanks