If all ships in the line were, for example, slightly outside distance, it might be impossible for the end ship to keep correct distance from the guide without getting dangerously close to her adjacent ship.
Okokuba zonke iinqanawa kumgca zaye umzekelo, zingaphandle nje kumgama, kunokungenzeki kwinqanawa esekupheleni ukugcina umgama onguwo ukusuka kwisikhokelo ngaphandle kokuba kufutshane ngokunobungozi kwinqanawa yayo emelene nayo.