gpsd: 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/sbin/gpsd - from package: gpsd

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