Hi I'm very new to this and have a issues that no-one will help me with hoping someone here can shead some light for me.
I have a 2003 Toyota Prado and my battery go flat recently i had it jump started and now my sat nav doesnt work nothing comes up at all the screen stays black. Can anyone tell me if my battery is weak will that stop my sat nav from working? I dont have the funds right now to buy a new battery and everywhere wants to charge to look at it.
Has anyone had this issue before?

Thank you all in advance