A lot of students will load the BC approach on the 430 and forget t
switch to VLOC, attempting to fly the approach with the CDI in GP
mode. While on GPS navigation, the needle will behave normally, a
long as the dead of the HSI needle is set to the BACK course.
Remember, GPS navigation is capable of reverse sensing if the course i
set incorrectly. While the CDI is in GPS mode, the Desired Track i
the back course heading, and must be set this way in order to ge
normal sensing, since GPS navigation is "to-to" navigation. Th
problem arises when the pilot forgets to switch the CDI mode to VLO
before intercepting the back course. At this point, you must als
remember to flip the HSI needle around to the Front Course for norma
sensing
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