People do fly into terrain in VMC but it is fairly rare, and they won't be setting 7700 when they realise the hill they turned towards is too close. An ELT which auto-activates is the best option.
https://www.sia.aviation-civile.gouv...2008_10_EN.pdf
Note: As ULMs are not certified, the accelerations, in particular when landing, are not necessarily compatible with the ELT(A) activation characteristics. Therefore, on some ULMs, the operation of an automatic activation ELT (ELT(A)) cannot be guaranteed.