Hi Erik and many thanks for the info.
Yeh, in Ubuntu I've previously just downloaded the correct file and the Ubuntu installer has installed it and OpenCPN has worked straight off. Same with Windows on my Desktop
I tried downloading a few versions but in Debian the resident installer does nothing, I assumed as the downloaded versions are incompatible with Debian.
Also, after setting up the repository tried to do it using the Synaptic Package Manager . . . but it never found opencpn.
Was thinking it would be a 2 minute job like with the other OS's but I'll have to leave it for now as it will take my total brain power to get my head
around trying to build from source code.
Many thanks, I will do it eventually.
Bye for now