Half a world away - but oh so familiar!
As someone who’s spent more than half their working life either as a ranger or in wildlife management, I can say ‘I know that ranger’. Or several like them!
My policy when faced with rangers or others claiming authority over that land I’m on is to:
1): Ask if they are saying that what I am doing is prohibited, or if it is allowed, but they are just asking me to stop as they are worried about it’s impacts.
If they are merely concerned, I’d have a friendly conversation giving them the chance to explain what it is they’re protecting, their concerns and just comply. Such compliance is not ‘binding’ it’s a one-off resolution to a human confrontation, and does not affect the ability of anyone else if the call is wrong. As rangers you have very little power to enforce, little recourse to science and hard evidence in the field, but are charged with protecting a huge range of values, many of which you can’t be expected to know the fine details of. So (as a good ranger) you express your concerns, admit your lack of certainty, and hope that through goodwill you can achieve a good result.
If they claim an action is prohibited (and if I disagreed/doubted), that’s another thing. I would ask what act it is prohibited under, and expect them to be able to give details of the act and what/when/how it prohibits it. If they still insisted then I’d ask for identification, contact details for them and their manager, and then comply. I’d make sure to follow up with a letter to that manager asking for details of the regulation and how it covered my activities ‘for my own information’. There is a history (here at least) of departments exceeding their authority in banning access and activities that we have a legal right to - and letting that pass and become the norm impacts not just me but all who follow.
My 2c worth.
Matt - ZL4NVW