Originally Posted by TylerJRiggs
My preference lies in the 62. I think it can't be beat.
(I use my unit for hiking, skiing, motorcycling, sailing on some little lakes, and hunting)
I'd second that. I'm happy with mine.
It's all a compromise. The 62s doesn't have a dictated 12vdc power connector like the 78 does. External dc power is though a mini-usb connector (5VDC). I run mine exclusively off PowerEx batteries and a PowerEx Wizard One
The 62 uses a quad helix antenna. The 78 is considered a marine unit. It uses a patch antenna, which has very good reception as long as the unit is held flat. The quad helix antenna improves reception and is better suited to holding the GPS in a more upright vertical position.
There's a 62/78 thread
that has more information.