GridmapNavSimul: 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

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/GridmapNavSimul - from package: mrpt-apps

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