How do you get up to date maps for navman my55T

Start at the navman website.

I should pre-warn you that they are not very friendly. About 4 years ago I bought my mom a Navman ICN 620, after 6 months I tried to get updates and called and emailed them for about four months finally when they responded they just said they were not updating US maps for any of their previous products. Looks like they are more an international company that sells in limited quantity in the US through Radio Shack stores. I have gone back to their website about 5 times since then to see if any updates were ever added and they never did.

If its an older unit I would replace it Tomtom makes a nice unit and Magellan even has a few units with free traffic updates (depending on area)

I finally just replaced the unit for her this christmas bought her a Magellan roadmate 1470 for $150.

Just FYI most GPS manufacturers want you to pay YEARLY for their map updates and if you skip an update you may have to also pay to do a firmware update. I have a Tomtom go 720 which is 2 years old they wanted $49 for a firmware update and $99 for the map update.