i thing u have 2 gmapsupp.img in your nuvi and sd card, with def maps like mfm and msm
u need to delete the 1 inside your nuvi, use only gmapsupp.img in your SD card
okey.. done.. thank you..

i thing u have 2 gmapsupp.img in your nuvi and sd card, with def maps like mfm and msm
u need to delete the 1 inside your nuvi, use only gmapsupp.img in your SD card