he HMV Altmark is a an old fishing boat that ran aground in 1960.
For access / parking you could use the same spot as my other nearby location (Morfa Beach) or you could park at Kenfig Nature Reserve and follow the signs to the smallest lifesaving hut in the UK (Kenfig Sands SLSC), and then head north along the beach itself. Either way, it will take about the same time - a good hour's walk from wherever you park. But if you have a bike capable of use on sand then I suggest that option.
To see the wreck, you will need to ensure the tide is in your favour. Either going out (at least 3hrs since prior high tide) or anytime after and up to about 4hrs before the next high tide.
This link: https://bit.ly/3o0M0p9 should get you real close to the location.
Land owner permission not required.
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Co-ordinates: 51.52543, -3.761895 • what3words: ///shaky.abundance.profiled