The internal GPS antenna is great for normal use. If there is excessive metal
around the mounting location it could interfere with reception. An external
GPS antenna can be installed into the dock's GPS antenna port in order to
achieve a better antenna mounting position.
Antenna Ports
Two brass antenna ports are found on the dock next to the sensor wires. The
left dock is female and accepts external GPS antennas. The other port is
male and only accepts radio antennas.
1. External Plastic Radio Antenna
The external plastic radio antenna is designed to be mounted to plastic, like
a number plate. It should be mounted vertically (up and down.) This
antenna works well for most applications and is included in most Voyager
Pro kits. Installing it enables buddy tracking features.