fore2gmn: 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 CentOS possible default full paths are:

/usr/bin/fore2gmn - from package: garmintools

You may install the required package with command yum install {package}
Error in other languages:
fore2gmn: bevel nie gevind nie
fore2gmn: comandă negăsită
fore2gmn: comando não encontrado
fore2gmn: commande introuvable
fore2gmn: command not found
fore2gmn: käsku ei ole
fore2gmn: không tìm thấy lệnh
fore2gmn: komanda nerasta
fore2gmn: Kommando nicht gefunden.
fore2gmn: kommandot finns inte
fore2gmn: komut yok
fore2gmn: nie znaleziono polecenia
fore2gmn: níor aimsíodh an t-ordú
fore2gmn: no se encontró la orden
fore2gmn: no s'ha trobat l'ordre
fore2gmn: opdracht niet gevonden
fore2gmn: parancs nem található
fore2gmn: perintah tidak ditemukan
fore2gmn: príkaz nenájdený
fore2gmn: příkaz nenalezen
fore2gmn: команда не найдена
fore2gmn: командата не е открита
fore2gmn: 命令找不到
fore2gmn: コマンドが見つかりません