Navigating Navionics

Just got Navionics app
Have the Humminbird 688ci HD & Apple phone and iPad
Looking for a good tutorial on using it either from you all or YouTube University or ...
Mostly fish Monterey Bay waters
Thanks

Thinking about buying this app in near future.   Please save all the steps/info so I can learn from you afterward  . Thanks in advance.

I have the free version on my phone now that they raised the price. It only shows some contours and saved points but doesn't show the rocky/sandy area textures. It used to be $14.95, then went to $24.95 - still worth it. But then the latest renewal wanted $49.95 and that is pure gouging. So I will hold off until they have a sale or until I feel I can't live without those rocky/sandy area details, which may or may not be accurate everywhere but definitely helped me target fish in the past. I never got the texture detail loaded onto my FF.