Mountains pose a problem for most travelers, being that they are normally an impassable obstacle. With the right equipment, however, they become a surmountable -- but less than simple -- challenge. With a grapple, it is possible to climb over the mountains in question, with only the highest peaks still impassable. There is always the danger of falling if the traveler isn't a skilled enough climber, but that is the price for this highly-desirable shortcut.
The Grapple was seen (and is absolutely essential) in Ultima V. After hearing rumors in Buccaneer's Den, the Avatar asked Lord Michael of Empath Abbey for the grapple. Only with it could the quest be completed.
Invaluable as a tool for exploration of mountainous territory, a grappling hook can be obtained from Lord Michael of Empath Abbey. It should be noted that although a grapple makes mountaineering possible, it does not necessarily make it either expedient or safe.
Ultima V: Lazarus
In Ultima V: Lazarus, the grapple can still be obtained from Lord Michael, but its use has been greatly simplified. When the party comes into possession of the grapple, large white arrows will appear throughout the land, indicating places in which the grapple can be used. If the player selects the arrow, they will be automatically transported to their destination without the risk of damage to the party.