map to edge 705

We can try - a couple of questions first though:

1. Where do you want to install maps of (what country or region)?
2. Do you have a microsd card (that you can store maps on) for it already, and if so, how big?
3. What have you tried so far? It may be that you're stuck at a particular part of the process that someone may be able to help you with.

Essentially, you have two options:

1. Download a map that someone else has made. There's a list here.
2. Create your own map based on OSM data that you've downloaded, using a program such as mkgmap and data from a site such as Geofabrik.

Questions similar to this have been asked before - it might also help to read this one or just search this help site for "Garmin".