Using Your Phone As A Chartplotter?

So when can we expect to use our phones as a chartplotter? I do not know of any electronic charts that are ready to be used on a mobile phone, but I’m sure that won’t take very long.
“I’ve been fiddling about with Earthmate’s excellent Blue Logger GPS, a smaller-than-iPod Mini-sized Bluetooth-enabled GPS unit that works like a charm with my various mobile devices (Powerbook, Nokia 6600, Pocket PC, etc). While I started out on my Pocket PC with XMap Pro, I quickly found myself finding and downloading GPS-enabled apps for my Nokia 6600. I stumbled across TomTom CityMaps over at Handango and quickly stocked up on the maps (US$4.99 apiece).”