Garmin as usual is either being ambiguous or only gives partial information. It's just the earliest StreetPilot devices capable of only using 'original format' [aka non-NT] CN maps which cannot use NT maps, e.g. SP 26x0. Many SP series can use NT maps, SP c3x0 [with V5.80 and later fw], SP c5x0, SP 27x0 for example. Even the non-NT SP 26x0 derivative Honda Goldwing Navi [first version] can use NT mapping since [Only registered and activated users can see links. ] so there may even be hope for SP 26x0 with firmware mod.