My local roro ferry drops you off pretty close to downtown. If you don't get a good fix as you get off the boat before you get into the urban canyon, satnav is

My local roro ferry drops you off pretty close to downtown. If you don't get a good fix as you get off the boat before you get into the urban canyon, satnav is pretty hopeless for a few minutes. Doesn't usually take 5 hours to figure out where it is though. At least not on my vehicles, even the one that's always getting confused.