Cannot see all rows in POI

Hello! I've just downloaded Redlight-Cameras.csv into my new Nuvi 660 using POI Loader. Original file when opened in Excel has 2665 rows, but Nuvi under Custom POI shows only 52. Is this kind of distance limit or what?
Same happenes when I load other custom POIs. For example, SanDiegoPOI.csv with 142 rows shows same 52 only. Any advise/explanation would be greatly appreciated.

Thank you!