I haven't been using modRana very long (I only have my n900 a few months) and have only used it a few times, once to go to a party in another city (Netherlands) where I didn't know my way round and a few times for testing driving to and from work. I especially like the big buttons because it makes it easy to use without taking the phone out of the RAM Aquabox on my motorcycle.
short story and pictures of modRana in action..

Sometimes you're riding around just enjoying the ride and end up somewhere unknown in a field
hmm, a dead end...

Better turn round, time to go home anyway..Fortunately I have my n900 with me.

Take the phone out... start modRana and put it back in (it was raining), Ah.. here we are...

Here is were the big buttons come in handy. easy to use even through the thick plastic. planning the route home...

And off we go...


Obviously can't take pictures while driving and the pictures have been scaled down and reduced in size so maybe not all that clear.

Now something I've been thinking of. On long highway trips without turns or something the screen stays on using battery power. It might be useful to turn the screen of between turns and switch it back on when a turn is approaching. saving the battery.

I dont have it connected to a charger yet on the bike and for sound I can use the fm transmitter ( I have a radio on the bike)
I havent tested the speech output yet on trips.