The free browser based Garmin Active Captain seems to work for me to see detail contours. For offline, you could always print screen those to paper.

 

Yeah Active Captain, I'll try that again, thanks

 

The free Argos app used to have lines.

 

CMAP or Navionics

 

I looked up Garmin Avionics (Garmin Outdoor Maps) and none of the ones offer the detail I need for on-shore fishing in need of depth from casting from shorelines

Here's a CMAP screenshot with not nearly enough detail in the tight depth lines coming off the point,( in green then yellow then) blue water depth lines. It goes from 3' to 42' and appears to go deeper in the dark blue area. It could be that the lines are so close together that the depth lines cannot be measured/calculated?

 

Following.
I’ve wanted and tried to do the same exact thing but for good sturgeon holes to anchor for c&r.

 

Garmin navionics mobile app has them

 

Perhaps you're referring to Android? My iPhone isn't currently showing a Garmin Avionics app, but thank you

 

Probably going to be tough without something like a Navionics+ subscription. I have the Garmin Activecaptain app on my phone and it shows my Navionics+ maps. Not sure what happened to the old Navionics/Boating HD or whatever it changed to, but may be worth seeing if there's a mobile only option still.