This app was mentioned in 5 comments, with an average of 3.80 upvotes
google maps cached is not much use as it isnt searchable and directions are not available.
recommend getting a dedicated app like navfree if you plan on using it as a sat nav
https://play.google.com/store/apps/details?id=com.navfree.android.OSM.OLD
TL;DW
Free Offline GPS
Navfree: https://play.google.com/store/apps/details?id=com.navfree.android.OSM.OLD&hl=en
Free IP Cam
IP Webcam: https://play.google.com/store/apps/details?id=com.pas.webcam&hl=en
IP Cam Viewer/Recorder
TinyCam: https://play.google.com/store/apps/details?id=com.alexvas.dvr&hl=en
Download Youtube Videos
Videoder: https://www.videoder.net/
Use Android As Dashcam App
AutoGuard: https://play.google.com/store/apps/details?id=com.hovans.autoguard&hl=en
Listen To Emergency Radio
Scanner Radio: https://play.google.com/store/apps/details?id=com.scannerradio&hl=en
Turn System Into Digital Frame/Window
Earthcam: https://play.google.com/store/apps/details?id=com.earthcam.webcams&hl=en
TL;DW
Free Offline GPS
Navfree: https://play.google.com/store/apps/details?id=com.navfree.android.OSM.OLD&hl=en
Free IP Cam
IP Webcam: https://play.google.com/store/apps/details?id=com.pas.webcam&hl=en
IP Cam Viewer/Recorder
TinyCam: https://play.google.com/store/apps/details?id=com.alexvas.dvr&hl=en
Download Youtube Videos
Videoder: https://www.videoder.net/
Use Android As Dashcam App
AutoGuard: https://play.google.com/store/apps/details?id=com.hovans.autoguard&hl=en
Listen To Emergency Radio
Scanner Radio: https://play.google.com/store/apps/details?id=com.scannerradio&hl=en
Turn System Into Digital Frame/Window
Earthcam: https://play.google.com/store/apps/details?id=com.earthcam.webcams&hl=en
TL;DW
Free Offline GPS Navfree: https://play.google.com/store/apps/details?id=com.navfree.android.OSM.OLD&hl=en
Free IP Cam IP Webcam: https://play.google.com/store/apps/details?id=com.pas.webcam&hl=en
IP Cam Viewer/Recorder TinyCam: https://play.google.com/store/apps/details?id=com.alexvas.dvr&hl=en
Download Youtube Videos Videoder: https://www.videoder.net/
Use Android As Dashcam App AutoGuard: https://play.google.com/store/apps/details?id=com.hovans.autoguard&hl=en
Listen To Emergency Radio Scanner Radio: https://play.google.com/store/apps/details?id=com.scannerradio&hl=en
Turn System Into Digital Frame/Window Earthcam: https://play.google.com/store/apps/details?id=com.earthcam.webcams&hl=en
> Free Offline GPS Navfree: https://play.google.com/store/apps/details?id=com.navfree.android.OSM.OLD&hl=en
I prefer HERE Maps. What does Navfree do that HERE doesn't?