Corrected entry: A "Union Jack" on land is called a "Union Flag." Not so commonly known by the layperson, but certainly well known by the members of the British military.
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Correction: The Flag Institute, which advises the UK government and United Nations about British flags, investigated this idea thoroughly in 2013 and concluded "Union Jack" is perfectly acceptable whether on land or not. Union Jack and Union Flag have been used interchangeably in both Royal and governmental statements through the centuries. "It is often stated that the Union Flag should only be described as the Union Jack when flown in the bows of a warship, but this is a relatively recent idea. From early in its life the Admiralty itself frequently referred to the flag as the Union Jack, whatever its use, and in 1902 an Admiralty circular announced that Their Lordships had decided that either name could be used officially. In 1908, a government minister stated, in response to a parliamentary question, that "the Union Jack should be regarded as the National flag".