Trio Avionics EZ Pilot - v 2.3 - Manual (Page 28)

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2. You must be in an area of good signal strength for your GPS receiver to operate
properly. If you try to use it in a hangar, for instance, the weak signals will not provide
reliable data and the “NO GPS” message will appear.
3. For reliable operation, you will probably need to employ an external antenna for your
GPS. Or, if using a portable GPS and you don’t have an external antenna, you will need
to mount the GPS where the antenna has a clear “view” of the sky in all directions at all
normal flight attitudes.
4. Some GPS units will not yield a serial output until a flight plan or “Go To” is entered
and NO GPS will be displayed until this is accomplished. Some other GPS receivers
output only a few of the parameters needed for autopilot operation which the EZ pilot will
recognize by entering the NO FPLAN mode. Other receivers (KING KLN-XX models, for
example) will not output a valid data link signal until a certain groundspeed (usually a few
knots or more) has been attained.
5. Some GPS units will not yield an output until a certain groundspeed is attained.