>for the times you're lost with a slow connection, no connection, in a foreign country, or with roaming charges. I have had exactly this problem this week, so

>for the times you're lost with a slow connection, no connection, in a foreign country, or with roaming charges. I have had exactly this problem this week, so it's been at the top of my mind. Algorithm-heavy is an understatement. Tasks that are more naturally done by the server (geocoding, routing) have to be shifted onto the client. Bear in mind that the cases you describe probably are also limited-battery and limited-memory. There is also some existing competition in this space that you would have to catch up to. Since UI acts as the main differentiator to users in my opinion, that probably ought to be your primary concern at first. Having said all of that, I would be super-excited to be involved with an Open Source/copyleft project like this.