xtide: 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 Debian possible default full paths are:

/usr/bin/xtide - from package: xtide

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

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