Abstract: A navigation system operable without a visible horizon is provided. The system can include a collapsible sextant apparatus having a first holder to accommodate a visual spotting scope and a second holder connected to the first holder to accommodate an electronic navigation device. The electronic navigation device can include elevation and timing factors for navigation. The first holder can include a rotatable base extending in a first direction, and a retention element disposed on the rotatable base to retain the visual spotting scope. The second holder can include a longitudinal member to retain the electronic navigation device extending in a second direction substantially perpendicular to the first direction such that the first holder is disposed substantially perpendicular to the second holder and the visual spotting scope and the electronic navigation device can be aligned at a predetermined angle.