I'm in the UK
The device is the Garmin GPSMAP450. It was launched in 2007. It is a fixed mount 4" QVGA unit for boats. It is detailed in this thread for the 5.6 upgrade.
Entry from Aurelia Wed Jul 06, 2011 4:35 pm
shows : GPSMAP 450/450s: 5.60
Link given is...
Hi guys
I understand this came out in Nov 2011 but all the links on the Garmin site to software for marine GPS come up 404.
Anyone have any idea how I can get this software ?
The boat I'm about to buy has the plotter fitted and I don't think it's been updated since it was purchased in 2007...