The development of autonomous platforms in the maritime domain poses significant assurance challenges. While maritime as a domain has some unique facets, it can be helpful to consider and draw lessons from other domains where autonomy is better established and assurance approaches are more significantly developed. This paper first explores the development of the prominent autonomy frameworks and assurance standards in the automotive domain. This paper then identifies the commonalities and differences between the maritime and automotive domain. Finally, the paper reviews the current status of autonomy frameworks and standards in maritime autonomy and concludes that there is a need for a single, unified autonomy framework for the maritime domain, which will then enable assurance approaches and standards to be more meaningfully developed and achieved.