Currently have a tomtom one xl. navcore version 8.010 map on it is number 915.5106
wanting to update to latest usa or usa/mexico map. what is the best one out there?

Look here: 930 Maps

See the table at the top to find out which maps are suitable for your navcore version.

How much storage space have you got? Got a sd card?
If less that 1 GB -->
United_States_930_5601 [880MB] OR
United_States_930_5601 with Automatic Installer & Patcher
; United_States v930.5601
9B 28 C5 FE 5D 6E 7A CD A4 5D F9 4C 5D 88 97 72 United_States-915.meta

That's the most recent available map.
Although, for your information, the new quarter maps are awaited any day now. But you should probably not wait for that because the necessary meta code will probobly not be immediately available.

thanks for the info, yeah, have less than 1gb, d/l now

Razorblatter wrote:Although, for your information, the new quarter maps are awaited any day now.

For your information, 935 was released yesterday morning.