So does this mean if the garmin cannot be changed that i cannot use this software ?
Yes, unfortunately, you can't use the GPS with it if it doesn't switch. 99.9% of devices do support the standard NMEA protocol, including most Garmin devices. Up till now, I don't know of one that doesn't but this could be the first.
Unfortunately also, this might be a problem for most non-Garmin software that you would think of using on your Axim.
Nathan