Like the guys above stated...the most recent will update all the previous updates....
Also...the HBPC update is for the pc program that manages your waypoints, routes, tracks,...if you don't manage your waypoints on the pc, you may not need this.....
Also the son2xtf updates are for converting HB .son files...if you're not going to need converting the files to use in a different program (I think for viewing in SIview) , you may not need this either....
Here is a good video tutorial for updating your unit....
How do I download Software to my HB Unit using MMC/SD card?
Rickie


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