The reply I had from a very helpful Nick Williams at Garmin may be of interest.
QUESTION
If I buy a Garmin 2610 with an US basemap, would I have any problems if I ever need to send it to Garmin Europe for repair?
ANSWER
No problem at all. Every Garmin GPS product is warranted to be free from defects in materials or workmanship for one year from the date of purchase.
The BaseMap is built into this product, and cannot be changed. World wide there are three BassMap areas, Americas, Atlantic and Pacific. The country in which your GPS is purchased dictates the mapping installed on the GPS.
If you buy in the USA you will get the Americas Highway basemap, this includes the United States, Alaska, Canada, Mexico, and Central and South America, and covers an area from W180 to W30 Longitude, S60 to N75 Latitude. Also included is a high-level worldwide map with political boundaries and major cities.
If you buy in Europe you will get the Atlantic Highway basemap includes Europe, extreme western Russia, Africa, and the Middle East, and covers an area from N75 to S60 Latitude, W30 to E60 Longitude. Also included is a high-level worldwide map with political boundaries and major cities.
If you buy in Asia or Australia you will get the Pacific Highway basemap includes Asia, Australia, and Oceania, and covers an area from E60 to E180 Longitude, S60 to N75 Latitude. Additional detail is included for the islands of the South Pacific and covers an area from W180 to W135 Longitude, S60 to N25 Latitude.
If you have any further queries please don't hesitate to contact us again.