Garmin Custom POI search and field size limitations??

I use csv format for my Nuvi 200 custom POI's. I have a few questions for experts:

1) Is only the custom POI "NAME" field (3rd or C column on the spreadsheet) searched or does the search function include contents of NAME field plus MEMO field (4th or D column)??

2) I hear Nuvi 200 only displays POI names 18 characters or less. I suspect the 18 character viewable length is just a truncation of the max character count. What is the max character count?

3) Can I assume a search will find characters hidden due to truncation?