Is there a way to leave bluetooth on while turning cell service off - a near airplane mode?

For my Google Pixel 4 on Android: I often go sailing out in the ocean or motorbiking in distant woods where there is no cell phone signal. I want to leave Bluetooth on so I can listen to podcasts, music and books through my ear buds, but turn cell phone service off so it is not using up power searching for towers that aren't there. Is there a way (or an app) to do this?