WebUpdater is for updating software on most devices and also voices and other such files, it doesn't update any mapping data other than gmaptz.img [time zone map]. Some info and the download link available here:
Code:
http://www8.garmin.com/products/webupdater/howtoinstall.jsp
I don't seem to have 'Webupdater' you mention in your post. Only Mapupdater. Can you give me a link to that? Maybe I don't need it as the map is up to date according to MapUpdater.
Unless you have an 'LM' subscription for lifetime maps, MapUpdater won't offer to upgrade existing OEM detail maps even at a cost. Instead of reporting the non-LM detail map is 'out of date' it gives that silly 'up to date' message which is quite self-defeating [aka really stupid] on Garmin's behalf, both from a marketing and legal liability point of view. GarminExpress will update the OEM detail mapping on LM devices free and also offer a non-LM update for a charge. At least that function is sensible.
GarminExpress [GE] combines the capabilities of MapUpdater [MU] and WebUpdater [WU] and has additional functions such as basic backup of device files. GE does not support many older auto devices such as StreetPilots. It's still very buggy and i won't use it, it's faster than MU/WU when it works OK, but it's still bricking devices occasionally. Best avoided imho. Garmin will not take responsibility if you brick an 'out of warranty' device like your 255W using GE. They claim it doesn't brick devices but the strongly anecdotal evidence is that it has many times.
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