this be revolutionary 3-4 year ago , but with new handheld device like the iPhone , etc show how a handheld interface should work , this begin to feel ancient . + Great reception + rugged -lrb- get a screen protector -rrb- + reliable - hard to remove memory card , which make the next negative even worse . - for the US Topo Mapsource CD set , you can only can transfer 2026 of the 7000 US map segment per memory card . this mean you can not simply load the entire US -lrb- 7000 segment -rrb- on a memory card . you need 3 512mb memory card . - the Mapsource datum be OLD . the 2003 Mapsource Topo CD set be miss street that be 20 year old in southern St Louis . the new 2008 Mapsource dvd be miss street that be 15 year old . Google\/Yahoo\/MapQuest find these street easily . do not surprise if the forest you be hike thru lead to a undocumented megamall . - Poor UI for drive direction , etc. . this be a hike boat device , DO NOT buy for exclusive use with you car . - searching for pous be very difficult . - map management be terrible . if you have multiple map , good luck figure out how to change the map in use . a example , if you install City Navigator , you topo will disappear bc the City Navigator cover the topo map . you have to turn off City Navigator , but it be bury deep in the menu system . - worst design bike attachment mechanism ever . it be too small for almost all handlebars . : -lrb- overall , I love it for hike , find it occasionally useful for biking -lrb- preven I from get lose -rrb- , and dislike it for car use , city exploration . Google Maps on a iPhone or Windows Mobile be much better .