relocation of map factor navigator maps to ext sd card failed. no more space in phone

hii,

my navigator is 3.11... version, android.

my internal memory
is full, but i have tons of space in external sd card. sadly no matter
how i tried "change installation sd-card" to install maps into external
sd card1, it just never happened.
it only make a copy of some maps
into external sd card, but it still keeps the original maps in the
internal memory and using it. if i delete the maps from the internal
memory folder, it won't be able to run,  and hence need to redownload
the maps.. and it redownload the maps into the internet memory again.

annoying.

anybody
can help ?  i need to travel oversea, i need to download new maps of
oversea country, but i don't have enough space in the phone as the
result from the software issue.



pls urgent help needed.
andrew