This is a section of the aprs.fi user guide.
Since the real-time map is quite heavy on computing resources, and appears slow (or does not work at all) on many old devices and mobile phone browsers, there is a Static map feature. It even supports looking up multiple stations at the same time, but due to technical limitations cannot show real APRS symbol graphics in that mode.
It is designed to be very simple and lightweight, and it should work fine on small devices or with slow Internet connections.
aprs.fi user guide