navigami

Navigami 1.06 on Nokia 6230i.
When I want to save as landmark the position were I am, I go to New Landmark, Last Known, Save. However, it seems to be a BIG difference between coordinates saved and my position shown in Position Menu. The difference can be as 10km... How can I save properly my position?
In what file format can I do the waypoint import/exporting?

Thanks!