Not sure CNE NTU on 1xxx will work properly (address search problems sometimes), better to use NT version. You can use the big JCV without any problem on 14xx.
For 54 use JCV for 40/50 NTU JCV. This only will work on 54 along NTU map.
Nuvi40/50 JCV
D3589100A.JCV -1 RAR archive, unpacked size 149.557.672 bytes
/D3589100A.JCV, length 149557672
Data JCV: length 149557672, name D3589100A.JCV
date 19.09.2013 17:36:44
006-D3589-10
picture size 212*234