I wasn't sure at first what the OP was asking for becuase I was always using my iPhone with the Seestar and never had to enter location coordinates.
Last week, I used my iPad instead and got the screen to enter coordinates.
My iPad is old and has a failing battery and it died twice before I got a power supply for it, and each timeI had to keep re-entering the coordinates.
I agree it would be nice to save at least the default coordinates for at least one location instead of having to keep re-entering them every time I use the iPad with the Seestar instead of my iPhone