[Az-Geocaching] What does Garmin's "geocaching mode" mean?

[az_pistolero]

My trusty old GPS-V gave up the ghost last week -- looks like the  
display is gone.

The old GPS-II+ and GPS-III units died or were donated a long time  
ago.   Guess it's time to retire my Touratech mounts and break down  
for a new GPS.


Garmin's touting a "geocaching mode" on their units.   Does anyone  
know specifically what this means?  Is there some special feature  
beyond an NMEA serial link included in these units?


I don't use GSAK -- I'm on a Mac using MacCaching, in case that should  
matter.


My interests are:  Great battery life, ability to load Garmin Topos,  
WAAS, 500-1000 waypoints, back-tracking, "Waterproof" or better,  
Durability.     Routing is