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It is legal to use the DME from a VORTAC station (see Is it possible for a civilian to use a VORTAC station? for details), but is it also legal to use the TACAN for bearing determination?

This would probably require different equipment, which is not typically installed on a civilian aircraft (see Why doesn't civil navigation equipment support TACAN? for details). But the answers to that question do not mention whether or not it is legal to install and use this equipment.

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You can buy and legally use TACAN equipment for GA aircraft from Bendix/King, but the system is expensive (close to US\$100,000), relatively heavy and requires rack-mounting.

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    $\begingroup$ They really went all-out in their sales copywriting: "An antenna is a part of this system, to maximilize the range of this system. Thanks to TACAN you will be able to control the pitch angle, and many other." $\endgroup$ – pericynthion May 10 '19 at 19:28
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    $\begingroup$ What's really funny is that the size and weight of the thing hasn't changed much since I worked on CH-46's in the Marine Corps. $\endgroup$ – Juan Jimenez Jun 12 '19 at 8:44

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