Garmin GTN 650Xi Series Pilot's Manual page 413

POWER LINE OBSTACLES
OBSTACLE
OBSTACLE GROUPS
An asterisk indicates when the obstacle database contains only
a single latitude and longitude for a group of obstacles. This
occurrence is rare.
190-02327-03 Rev. C
POWER LINE OBSTACLE LOCATION
Red power line is above or within 100 ft below current
altitude.
Yellow power line is between 100 ft and 1,000 ft below
current altitude.
White power line is between 1,000 ft and 2,000 ft below
current altitude.
Pilot's Guide
Hazard Awareness
5-105