They will import several formats. The most universal will either be CSV or GPX. Depending on what unit your coming from. I came from Garmin and GPX was the easiest for me. Export either from the unit into GPX or with Garmin Homeport application.
I decided to manually enter them to the points list..... (there is an "add point" key on the points list page)---- it goes pretty fast. The entry is very user friendly.