Garmin Sat Navs with "route" option

[Mr Plow]

Hi All

I'm currently looking to replace my old Pogo drive sat nav with one that accepts with own routes from TYRE or such like.
I've been looking at the many Garmin options and understand that if they have a number larger than 0 in the "route" then they will accept my own routes.

Does anyone know the difference between models with 10 or 100 in the route spec? Is this the number of way points or co ordinates that the model will accept?

Any help appreciated.

Cheers