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Could anyone here tell me if a portable GPS system
of high quality would be of practical application to
small aircraft? It can be mounted.

Thanks.

--
Mark

In general terms, anything that helps you know precisely where you are is
not useless in general aviation. Whether your device actually does that
will depend on its antenna and how well it functions in a typical
cockpit.

As you can see from the other responses here, GPS applications for small
aircraft are already highly developed, and range from aviation-specific
portable units to fully integrated and coupled systems, certified for
instrument approaches.

If you are thinking of taking a small device with you in a freind's
airplane to help you know where you are, then go for it, see if it works.
If you are even remotely thinking of marketing something, you would
probably do well to take stock of how well the aviation market is already
covered.