Standard Horizon Explorer GPS GX1700 Owner's Manual page 21

5. Referring to illustration below, make a 1.2" (30 mm) hole in the wall, then
insert the Extension Cable into this hole. Connect the Gasket and Mount
Base to the Extension Cable Connector using the Nut.
6. Drill the four Screw holes (approx. 2 mm) on the wall, then install the
Mounting Base to the wall using four screws.
7. Put the Rubber Cap on to the Nut. The installation is now complete.
The routing cable can be cut and spliced, however care needs to be
taken when reconnecting the wires to ensure water integrity.
Before cutting the cable make sure it is not plugged into the radio.
After cutting you will notice there are the following wires:
Brown, Purple, Blue, Green, White
 The White and shield wires are wrapped in foil. Remove the foil,
and separate the White and shield wires.
GX1700
External Speaker Connections
Ferrite Core
Wall
Routing Cable
Mounting Bracket
NOTE
, Shield

Gasket
Cap
Nut

Page 21