Is there a map size limit for Streetpilot? I can get the latest Australian NT maps (266MB) as 'gmapprom.img' working fine but when I try the Garmin Aus Topo maps (3.32GB) as gmapsupp.img Streetpilot will not start. The topo maps are unlocked and they display fine in basecamp. I've tried different filenames but to no avail.

Any ideas?