A computer implemented method for determining a requested map location includes providing {HEAD ~ a database} holding {TAIL ~ a plurality} of map objects having respective descriptors and loci 
A computer implemented method for determining a requested map location includes providing { HEAD ~ a database } holding { TAIL ~ a plurality } of map objects having respective descriptors and loci
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH