I use them both and find them excellent. You can use deepview by converting the .dat file to a .xtf. I did this with the Humminbird download Son2xtf. The deepview ver 3.0 download can be found at Download | DeepVision . I think there is a newer version out now. Here is the same structure on the 2 different viewers. The humviewer software can read the .dat file with no conversion needed.

Hope this hasn't violated any forum rules with the link. If so, moderators please delete.

Deepview
Name: treextf32.jpg Views: 2710 Size: 39.8 KB

Humviewer
Name: treedat32.jpg Views: 2456 Size: 29.4 KB