RhumbSolve: 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/RhumbSolve - from package: GeographicLib

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

On Debian possible default full paths are:

/usr/bin/RhumbSolve - from package: geographiclib-tools

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

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