gpsprof: command not found

Have You tried accessing the binary with the full path?

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/gpsprof - from package: python-gps

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