A quick google search brought this up.
Historically, the distance to the visible horizon at sea has been extremely important as it represented the maximum range of communication and vision before the development of the radio and the telegraph. Even today, when flying an aircraft under Visual Flight Rules, a technique called attitude flying is used to control the aircraft, where the pilot uses the visual relationship between the aircraft's nose and the horizon to control the aircraft. A pilot can also retain his or her spatial orientation by referring to the horizon.
The use of the visible horizon on the prairies to maintain altitude in a turn will be very beneficial to you.
Conversely using the visible separation of earth and sky in mountainous terrain during a steep turn may prove to be not exactly beneficial in maintaining accurate altitude all the way around a steep turn.