Well I have one of Southwest Airlines B737-300 series to take off and landing in Harlingen Houston Tx. I can align with the GPS but over time I fly beyond the track how it without landing on it until it happens. I have the correct radio settings and where to put the ILS runway or title in the box title or course cash.

the plane can not land, I think … you have to fly manually and remember to check NAV1 in quenching. you should hear sound from time to time which is how you know you have the signal. the header goes in the box of course. Also remember to check that the director flight became autopilot and is completely off. Also since you have two choices on autopilot "nav / gps" ensure is in navigation.

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