Raymarine - GA150 GPS Antenna

The antenna can be used to improve the reception of your Multifunction Display's built-in GNSS (GPS / GLONASS) receiver and can be mounted either on a flat horizontal surface or on a suitable pole.
 
Optional external GPS patch antenna for use on all a9, a12, eS9 and eS12 model MFDs (MFDs Internal GPS antenna must be ON)

Ideal for installations where the display is mounted below decks or under a hard top

Flush or pole mount capabilities

Includes a 10 meter Cable

When connected to a a Series, eS Series or gS Series MFD:
50 channel GPS receiver

Space Based Augmentation System (SBAS) enabled

Satellite Differential Type: WAAS (United States); EGNOS (Europe); MSAS (Japan); GAGAN (India)

< 9.84 ft (3m) accuracy typical, < 16.4 ft (5m) accuracy guaranteed

Very high sensitivity: -162 dBm