Transfer problem from basecamp to nuvi

Hello, new member here.  I created a simple one-way route on my basecamp ( 4.8.7). It is named and shows up on "my computer". When I used the "device" button (upper LH corner) it indicates it is being sent to the nuvi 755 and I get a message saying "TRANSFER COMPLETE" but I cannot find it anywhere on the device.  Looked in "FAVORITES" & "CUSTOM ROUTES".

I see the steps of the route (Route to S-bury) on the left column in Basecamp.  I have a8 Gb SD card in the device (titled Nik-1) which sometimes appears before the nuvi fully engages with the BaseCamp program.  The steps of the route appear there as well. I take this to mean the route DID transfer to the SD card in the nuvi but how to I connect it up to show me the route when I want it?

Thanks for your replies.  Obviously I am totally tech ignorant & a declining geezer to boot.