I want to update the maps, but I don't know how.
It has a memory card in that carries the maps, so I don't know how I could update that on my home computer.
Also, ho can I tell if the respective maps I use have been updated. I live in a new estate and I want to know that that estate's maps are visible before I would purchase an update.
You can not update the official Navman maps on this device. You can however
unlock the iCN520 and install other GPS software on it. The iCN520 can run virtually all the major GPS software available today; from Tomtom to Miomap and beyond.
how to unlock the iCN520 can be found at:
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If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter". http://electronicshelponline.blogspot.com/
You need to have your satnav registered with garmin. Log into myGarmin and click on the myMaps tab at the top of the screen. If you don't already have a map of the Philippines click on "buy more maps" and follow the prompts. If you already have a map that you just want to update you can get details of how to update it at http://www.fixya.com/support/r5628920-update_garmin_satnav_maps You can also get details there of how to register your satnav with garmin if you haven't already done so.
Please note that if this is not an update it's unlikely that your nuvi 255W will have enough space to hold a second map. If you're not updating or replacing a map I would advise against buying it as a second map. It is possible to install a second map to a memory card but there is a risk that it may not work. Memory cards in garmin satnavs appear to be very hit and miss. Some work and others don't for no aparent reason.