The AIRAVE or the AIRVANA will only work at the location tied to your address in your Sprint account. You can not take the AIRAVE or AIRVANA with you to another area for travel purposes, period. This is the reason why it requires a GPS in the first place - as a measure to make sure you aren't hauling it around using it to get free service wherever you go.
Anecdotally, I have an AIRVANA because the CDMA signals from VZW/Sprint in my area are awful and Sprint sent me one for free and I do not pay for the AIRVANA service.
Unfortunately, not only do I get lousy CDMA signals but I have poor GPS reception in the area, effectively rendering the AIRVANA useless since it won't work without a GPS lock.
Thus, it sits in the box Sprint sent it in my closet, where I use it for the free extra upgrade every 2 years.