Unfortunately there aren't any resources with the game's maps, however, these game's dungeons are short so getting lost isn't that big of an issue. However...

https://www.therockmanexezone.com/wiki/Rockman_EXE_Phantom_of_Network (warning for game spoilers, check at your own risk.)

To be a Java game, this one is ambitious, it's a full Battle Network game with about everything you'd expect from it, almost nothing got cut (besides music, seriously, only the final dungeon has any music other than the internet theme), to the point there's even a mechanic meant to be a simpler NaviCust. In the story department is nowhere near as good as 3, but it's perfectly serviceable, and it has some amazing concepts such as the final villain which I would have loved to see used more in the actual main series. It's a perfectly alright Battle Network game.

Some things to note however.
- Regular enemies have i-frames, but can also be stunned like you'd stun a boss.
- Because of Java limitations there's very few tracks and the ones that exist will be repeated endlessly, feel free to mute the game if you get too tired of the music.
- The fan-translation has Buster MAX as an option, which I recommend if you want to get through the game quickly.
- There's a chip in Undernet 4 that makes the backtracking in later scenarios and requests way, way easier, make sure you have 150 bugfrags for it.

Shoutouts to HatMan, one of the coolest designs in the game and also my favorite boss.