ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV / Applications that use TMATS benefit from the ability to presume that the TMATS data is well constructed. This need is met by a TMATS validator. Some classified systems need source code rather than an executable to avoid expensive testing before being allowed in. An Open Source Validator is proposed, presented and made available to the public. Major points and difficulties are discussed. The source is available in a Visual Studio 2008 project here: www.bkelly.ws/irig/validator.html A bulletin board for TMATS / Chapter 10 discussion is here: http://www.bkelly.ws/irig_106/