There is three companies there that carry GPS and when I talked to them they were pretty knowledageable.
Although today I dont know how you saw anything. That was the busiest Sportsmen Show day we've had in years (8 years to be exact). It was just insane, I just got home after a 14 hour day down there, it was not a fun day on the grounds (Like the traffic line ups? )
As for the show, yeah its more or less a hunting and fishing show with some extras thrown in.