The 580 is definitely not the same as the 5.8NA. I have owned two 5.8NAs, and had a chance to sail the 580 last year.

Differences:
- 8.5 feet wide
- Hulls are different (finer entry)
- Boom
- Roachier main
- Centerboards
- Heavier

This boat is intended to be a recreation boat. It is extremely stable, but slightly less lively than the 5.8NA.

Roger

Nacra F17 USA 320 We Don't Need No Stinking Jib!