I couldn't find any discussion of how the GPS on the N800 or N810 compares with dedicated GPS units (apart from lock-in time). Has anybody had experience with both? There are cheap bluetooth units for the N800 (about $20) now, but there are also refurbished dedicated GPS units going for $79 or so. Anybody know how good the NITs are versus cheap (and also pricier) dedicated GPS systems? Has anybody used the Tablets for GPS in the wilderness (or as a "hiking" or "handheld" gps, like, for example, the Garmin eTrex) as well as on roads as a "dashboard" unit?