Wendy, Here is your answer as taken directly from the Read Me for Sendero GPS Version 4.22: KeySoft GPS compatibility list: GPS version 4.x is compatible with mPower and PK units running KeySoft 7x. Version 4.x does not run on the Classic BrailleNotes. GPS 3.51 is the last version to run under KeySoft 6.x. Note: The only changes in version 3.51 over version 3.5 have to do with operation in the Australia latitude/longitude area. Thanks, Kevin I would encourage you to visit the Chaos World of Assistive Technology Blog at: http://www.chaosat.wordpress.com/ Postings are dealing with the latest and greatest happenings, tips and tricks and other items of interest. -----Original Message----- From: gps-talkusers-bounce@xxxxxxxxxxxxx [mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Wendy Slominsky Sent: Saturday, June 28, 2008 10:45 AM To: gps-talkusers@xxxxxxxxxxxxx Subject: [gps-talkusers] GPS 4.22 Will it work on the PK running version 6.0? No virus found in this incoming message. Checked by AVG. Version: 8.0.101 / Virus Database: 270.4.2/1523 - Release Date: 6/28/2008 7:00 AM