This is a very short and simple tutorial how to mod influence radius of navies and armies. I couldn't find any tutorials how to do it , but eventually after some digging in DB solved the problem . To save time for others I wrote this tutorial (for newbs like myself).

The influence radius is the red circle you see when you mouseover your or enemy troops. The circle determines zone which you cannot pass without engaging the enemy and vice versa.

The values to mod are <zone_of_control_land_radius> and <zone_of_control_naval_radius>. They are located at <data.pack/db/campaign_variables_tables/campaign_variables>. The default values are 3 and 6 respectively, you can play with them to determine which ones are better for you, but in my mod I have set them to 5 and 15. No more enemy navies and armies sneaking by me and blocking my ports or taking my cities.