The TZT's do not have a waypoint password function to protect them from being deleted or changed.
Do you have waypoints that are asking for a password?
No I was hoping for a way to put a password on my machine to keep someone from getting on it and copying my numbers onto a card of their own or manually looking up numbers in the machine
No there is no waypoint password feature. It is easy enough to back up the points and clear them so when you leave the boat there are no points for anyone to take.