You can find a Garmin Basecamp guide here:
http://www.gpsrchive.com/BaseCamp/index.htm
http://www.newenglandriders.org/GPS/Learn_BaseCamp_PC.pdf
http://www.newenglandriders.org/GPS/Learn_BaseCamp_MAC.pdf
https://www.garmin.com/en-US/learning-center/basecamp-pc
https://www.garmin.com/en-US/learning-center/basecamp-mac
To adjust detail level in Basecamp
Click Detail Level to add a check mark beside it and enable the Detail Level drop down menu.
Basecamp can read the map data off your Backroadmapbooks SD card when you have it inserted in your GPS and plug it into your computer using a USB cable.
Under the devices Panel on the left menu in Basecamp you will see your GPS and SD card listed.
The map data can be loaded from the SD card and viewed in Basecamp, Right click map name and choose Select.
When Viewing the maps from the SD card there are some printing limitations: