Different Means of Navigation & Approaches

MLS

LAAS

NDB

LOC / LOC-Back Course

LDA; SDF

WAAS/LAAS

NON-GYRO

provides horizontal
+

vertical guidance

Minim. Altitude = DH(A)

LOW to VERY LOW LIMITS

(ILS CAT > 1-2-3)

provides horizontal
-OR-

guidance in Azimuth
ONLY

Minim. Altitude = DH(A)

GPS provides Horizontal Guidance ONLY
unless a/c is equipped with...

WAAS/LAAS-Receiver;

then it also provides Vertical Guidance

Visual Approach
(Must be able to maintain visual contact with airport/RWY of intended landing till T/D.)

Contact Approach
(Must be able to maintain contact with airplane to be followed till ...)