These were taken from the Official Guide released in Japan - http://www.21010.net/club/bn/ngc/gwrj/index.html The numbers on the courses reference screenshots & text in the guide so they're not really relevant here. Plan your routes!
[Edit: August 9, 2023 -Added the in-game free roam map and mini-map sprites. Images courtesy spriters-resource.com ~meauxdal]
Dolphin Park Exhibition - Larger version
Lost Temple Lagoon Normal - Larger version
Lost Temple Lagoon Hard - Larger version
Lost Temple Lagoon Expert - Larger version
Southern Island Normal - Larger version
Southern Island Hard - Larger version
Southern Island Expert - Larger version
Aspen Lake Normal - Larger version
Aspen Lake Hard - Larger version
Aspen Lake Expert - Larger version
Ocean City Harbor Normal - Larger version
Ocean City Harbor Hard - Larger version
Ocean City Harbor Expert - Larger version
Arctic Bay Normal - Larger version
Arctic Bay Hard - Larger version
Arctic Bay Expert - Larger version
La Razza Canal Hard - Larger version
La Razza Canal Expert - Larger version
Strongwater Keep Expert - Larger version
In-game mini-map sprites: