The 010-10813-00 Mini-B Data cable converts the TTL level data from the Nuvi to RS-232 data levels, but leaves the data in Garmin Binary format.
The Gtrans cable does that too, but also translates the Garmin Binary data into Standard NMEA sentences, which are much more user friendly for APRS applications and the Kenwood D7/D700/D710 radios. If you want to use any of the listed Nuvis with an OT2m, then all you really need is the 010-10813-00 Mini-B data cable. OT2m have the Garmin to NMEA translation built-in. If you want to use any of the listed Nuvis straight to an application needing Standard NMEA sentences, or an above listed Kenwood, you will need the Gtrans cable. Hope that clears it up for you. 73, Randy WF5X
