OK guide. Can also find Alien Monolith by exocraft with Signal Booster module. Another way to find a Portal's location is using an other portal, after getting the glyphs/address of target planet from photo mode. Do not need to land on a planet to use photo mode towards it (do photo, to space station or freighter or Anomaly for TP to a base close to a portal). Another option is a Signal Booster, more tricky since have to take the planet code and put into a 3rd party tool, Coordinate Plotting Application (do a search). A few planets/moons do not have a portal though, higher chance in systems without Space Station.
OK guide. Can also find Alien Monolith by exocraft with Signal Booster module. Another way to find a Portal's location is using an other portal, after getting the glyphs/address of target planet from photo mode. Do not need to land on a planet to use photo mode towards it (do photo, to space station or freighter or Anomaly for TP to a base close to a portal).
Another option is a Signal Booster, more tricky since have to take the planet code and put into a 3rd party tool, Coordinate Plotting Application (do a search).
A few planets/moons do not have a portal though, higher chance in systems without Space Station.