I think you might misunderstand what wanderer does. It is not a maps service like Open Street Maps. It's simply a database in which you can store your GPS tracks. So the workflow would look like this: you are in the woods and record your track (e.g. with osmand) -> you store your track in GPX format -> you upload your track (and any additional info like a description or photos) to wanderer -> before your next adventure you check wanderer to decide what you want to do