garmin_dump: 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 CentOS possible default full paths are:

/usr/bin/garmin_dump - from package: garmintools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/garmin_dump - from package: garmin-forerunner-tools

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

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