US Sat Nav

Today's excitement is buying an £18 Garmin Nuvi 200 (might be a 250, we will see when it arrives), a 3" screen car sat nav from the late 2000s. Plan is to flash it with free OSM mapping for the places I have to go to in the US, freeing me from the hassle and expense of crappy car rental sat navs. Maps are downloading, gadget will be here in a few days. We'll see how we do.

Main concerns are that I won't be able to get a newish firmware on there using the current update software, or that the onboard GPS constellation almanac will be so outdated that the first lock takes 30mins (this is the reason my Garmin i3 became unusable despite having new maps).