I've always been really disapointed that google let their planetary maps stagnate.
I work (~5% of my work week) on https://trek.nasa.gov/ . Our front page sucks, but the individual map browsers are quite rich in terms of available layers and tools. Our UI is... not optimized for discoverability, but there's a lot there. Mars is at https://trek.nasa.gov/mars/
Was about to post a link to the same, can confirm, perhaps not as slick as googles offering but a much better map, it actually has a scale bar and tools to help you measure things.
I work (~5% of my work week) on https://trek.nasa.gov/ . Our front page sucks, but the individual map browsers are quite rich in terms of available layers and tools. Our UI is... not optimized for discoverability, but there's a lot there. Mars is at https://trek.nasa.gov/mars/