GPS and RNAV Approaches

Depending on the capabilities of the RNAV system, different minimums may apply.

RNAV Approaches

RNAV 11 KSBP

Non-WAAS GPS systems use the LNAV line of minima.
These approaches from left/right lateral guidance only (no glideslope), and are flown like a non-precision approach with step-down fixes.
They do not have angular guidance like an ILS or LPV

Some large aircraft are equipped have non-WAAS GPS, but have additional baro-aiding capabilities that allow them to use the LNAV/VNAV line of minimums. (A WAAS-enabled GPS can also fly an LNAV/VNAV, but usually there is an LPV available and it will select that instead.)
LNAV/LNAV also provide vertical guidance, using a glideslope computed by the GPS.
Like an LNAV, these do not have angular lateral guidance but a fixed 0.3nm sensitivity inside the FAF
They will have have higher minimums than an LPV

WAAS-enabled GPS units can fly LPV approaches, which provide ILS-like minimums
Like an ILS-these provide angular lateral guidance to the runway, with a 700 foot width at the threshold
Unlike an ILS though, the sensitivity remains at 700 feet as you travel down the length of the runway
LPVs also provide ILS-like vertical guidance, using a glideslope generated by the GPS unit

In some cases, terrain or obstructions do not allow publication of vertically guided LPV minima, in which case LP minimums will be published
Similar to a LOC, these provide ILS-like lateral guidance but no vertical guidance
They are flown with a MDA and step down fixes.

Below are the approach sensitivities, indicated by full-scale deflection of the CDI:

RNAV Sensitivities

GPS overlay approaches are designated non-precision instrument approach procedures that pilots are authorized to fly using GPS avionics.
They have names like VOR/DME or GPS RWY 15
GPS-equipped aircraft do not need underlying ground-based NAVAIDs or VOR/DME avionics to fly the approach.

KINW VOR or GPS Runway 11