SM4, Duffman and others are spot on.
Simple rules:
If you are LOST, say so and ATC will help you. As this constitutes a minor 'emergency', and incident report will be filed. At a guess, the 'lost' call could include a 'PAN PAN'.
If you just want to verify/determine your position, or want a radar advaisory heading, ask and you shall receive. No paperwork, no charge..... all part of the service.
Either way, don't let 'positional uncertainty' lead to a real incident, such as a VCA.
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