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Thanks again for all the help folks.  With the help on this topic plus a few hours of reading other posts I was able to install a few new maps on my Oregon 450t with absolutely no problems.  Just put the card in the reader, ran the files, installed maps and I'm up and running.  Much easier than I thought it was going to be.  Maybe someday I can pay it forward and help someone out. 

Thanks again!! 

Great info!  So two more related questions.

1) is it best to download maps into Basecamp first (like free maps from this site) and then upload onto my Oregon when I connect?

2) I've gone through the tutorial on sending maps from Basecamp to my GPS and there is a note under step 9 that says that previous maps will be overwritten when uploading new maps.  Is that the reason for assigning new names while in basecamp? 

Sorry for the long title and I hope this question is in the right part of the forum. 

GPSr: Oregon 450t

Question:  Despite the fact that this unit comes with preloaded topo maps, I'm going to want to add more maps in the future.  Specifically Michigan (Upper Peninsula) and Canada (Ontario).  I know that I can purchase 24k maps from Garmin or other sources by either getting a loaded micro SD card or by downloading the maps.  Now, would it be best to buy a new, clean micro SD card and use that one card as storage for all the custom maps I would like to create in the future or better to get the micro SD cards that are already loaded with the maps?  Also, as a follow up, if I create maps and save them to the SD card when I go back and add more maps do I have to upload everything all over again? 

I appreciate any input and if I'm in the wrong place just steer me in the right direction. 

Thanks