I have found it very beneficial to play the recording back on the unit at the same time as viewing in Humviewer ...

This gives 2 tools to inspect and interpret "points of interest" found in either ...
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Exporting waypoints out of Humviewer is as simple as choosing "File/Export" - changing the "File Type" to "Humminbird .gpx" - and saving the file somewhere you can open it directly with HBPC ...

Rickie