My setup:
BaseCamp Version 4.1.2 (4.1.2)
Mac OS X 10.8.3
MacBook Pro 8GB
Map: City Navigator Europe NTU 2013.4 Ireland & U.K.
BaseCamp's map display is centered on London, U.K.
Find-option setting of Location is "Center of Screen"
The problem: Asked to search for "Staplestreet, Kent ME13 9TX, ENGLAND," BaseCamp jumps to somewhere near Cincinnati, OH, and gives up with the note that "Search was limited to 500 mi." Why does it jump to a different continent, one whose maps aren't even loaded?
Google Maps finds this location with no trouble at all. If I have to conduct searches in Google Maps and copy the coordinates to BaseCamp, that's a sorry state of affairs.
I'm coming reluctantly to the conclusion that Google Maps is generally much more robust than BaseCamp. Garmin should be afraid, very afraid.