You're not wrong, I've got the 3760T and have been giving a lot of rounds with this subject.

3760T simply ignores any geotagged picture (Pictures, JPEG folders, even GPX), to replace this Garmin links the picture with a POI.

Before you could make this with pictures from Garmin Connect Photos, it's upload the picture, the POI and link her. Now, SAT Garmin answer me that there's not a simple way to do this...for not say that they have not a correct answer.

The simplest way I see is import the picture with BaseCamp (filling name, coordinates...) and upload to GPS...but it stays just one step: upload the picture, the POI...but no links them, so this step should be done manually with device, going to Favorites, edit POI and attach with picture.

I feel like I've been cheated with the "photo navigation".