nccnav: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/nccnav - from package: ncc

You may install the required package with command apt-get install {package}

Error in other languages:
nccnav: bevel nie gevind nie
nccnav: comandă negăsită
nccnav: comando não encontrado
nccnav: commande introuvable
nccnav: command not found
nccnav: käsku ei ole
nccnav: không tìm thấy lệnh
nccnav: komanda nerasta
nccnav: Kommando nicht gefunden.
nccnav: kommandot finns inte
nccnav: komut yok
nccnav: nie znaleziono polecenia
nccnav: níor aimsíodh an t-ordú
nccnav: no se encontró la orden
nccnav: no s'ha trobat l'ordre
nccnav: opdracht niet gevonden
nccnav: parancs nem található
nccnav: perintah tidak ditemukan
nccnav: príkaz nenájdený
nccnav: příkaz nenalezen
nccnav: команда не найдена
nccnav: командата не е открита
nccnav: 命令找不到
nccnav: コマンドが見つかりません