Why are there no 2 1/4" (57mm) NAV radios? or are there?

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JamesAero

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Joined
May 10, 2010
Messages
46
Location
Salem, OR
There are several 2 1/4" (57mm) COM radios and even transponders, but why aren't there any NAV radios to match? Some of these COM radios even have the ability to receive down to the 108Mhz frequency but provide no NAV output. Even the Sporty's hand-held radios can give NAV guidance. The SP-400 will even give ILS guidance. Am I missing some obvious reason these aren't available?

James
 

wally

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Joined
Mar 31, 2004
Messages
928
Location
southwest TN.
Probably the old supply and demand thing.

Almost everyone is using GPS for navigation nowdays. So there is no real demand for a little nav radio. For a very few hundred dollars and some Velcro, you can install a navigation instrument that shows your present location to a few hundred feet, shows your heading, your ground speed, and more.

Shucks, GPS receivers now do all sorts of helpful things. I haven't found one that will make a good cup of coffee yet but there are several that will show you where and and will even lead you to a place you can buy one!

Wally
 

rdj

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Joined
Sep 10, 2009
Messages
310
Location
Northern California
The only reason 2-1/4" COM radios and transponders exist is for the sailplane folks, who need light and small. However, the sailplane folks don't need NAV, hence there's no market for them.
 

djschwartz

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Joined
Jun 21, 2008
Messages
982
Location
Portland, Oregon
There are several 2 1/4" (57mm) COM radios and even transponders, but why aren't there any NAV radios to match? Some of these COM radios even have the ability to receive down to the 108Mhz frequency but provide no NAV output. Even the Sporty's hand-held radios can give NAV guidance. The SP-400 will even give ILS guidance. Am I missing some obvious reason these aren't available?

James
Too small to make a really practical display for primary use. No one would ever use a radio like the handhelds you mention for actual IFR navigation. Other than the possible use as a last ditch backup for a major system failure, inclusion of these features in the handheld is largely a gimmick to appeal to the desire for "coolness".

And I'll second Wally's comment about GPS and VOR market demands in today's world.
 

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