Which category of IAP provides both lateral and vertical guidance without ground-based support?

The category of Instrument Approach Procedure (IAP) that provides both lateral and vertical guidance without relying on ground-based support is the approach with Vertical Guidance. This type of approach utilizes satellite-based navigation systems, such as those involved in the Global Navigation Satellite System (GNSS), which allows for precise guidance during both the horizontal and vertical phases of the approach.

In contrast, precision approaches typically rely on ground-based navigational aids, such as Instrument Landing Systems (ILS), to provide accurate lateral and vertical guidance. Visual approaches are conducted primarily under VFR (Visual Flight Rules) conditions and do not involve specific guidance, relying instead on the pilot's visual references. Lastly, a standard instrument approach may provide lateral guidance but often does not include vertical guidance unless specified.

Thus, the approach with Vertical Guidance stands out as it delivers comprehensive navigational support through modern technology without the need for ground infrastructure.