Peking to Paris 2013 - Garmin 78s GPS Setup & Use Guide
Garmin 78s P2P2013 - Setup & Use V2.doc Page 14 of 15
Section 3 – Installation
Your car preparer should be made aware of these GPS installation essentials.
1. Power Supply
Connect your GPS directly to the vehicle electrical supply (12 volt) through a suitable fused
connection.
Do not rely on the cigarette lighter plug-in power lead supplied with your GPS – It will fall out.
When navigating at speed it may useful to hand hold the GPS to enable easier button
pressing and a closer view of the screen. Leave enough slack in the power and aerial lead to
make this possible.
2. External Aerial
An external aerial with a clear view of the whole skyline is essential for the best accuracy.
The correct antenna for the Garmin 78s is GA 25MCX as available from the Garmin store
here https://buy.garmin.com/shop/shop.do?pID=1326 Ebay is also a good source for generic
versions of this antenna but take care to get one with the correct MCX type connector.
Position the aerial – usually fitted with Velcro or double sided tape – on the roof behind the
front screen above the co-driver’s seat. Obviously open or soft-top cars will need alternative
arrangements but always aim for the “complete skyline view”.
Run the aerial lead across the roof and through the door shut. Protect the lead from being
trapped when the door closes and secure with gaffer tape.
3. Fixing
Fix the GPS securely within reach of the Navigator using a mount that is easy to detach.
Avoid direct sunlight on the display screen – the screen is much harder to read if bathed in
bright sunlight.
Most Garmin mounting brackets are quite flimsy and not really suitable for harsh off-road rally
use. We recommend the range of Ram mounts http://www.ram-mount.co.uk/
To fit a Garmin 78s you will need…
A cradle.. http://www.ram-mount.co.uk/ram-holder-for-garmin-gpsmap-78-p-1596.html
A diamond base.. http://www.ram-mount.co.uk/diamond-base-with-1-ball-p-1271.html
(one of these is required to join the cradle to the arm. A second base can be used to join the
arm to your dashboard although a wide range of options is available for mounting to a roll
cage or even to glass, although you are advised to avoid suction mounts for Peking to Paris)
A double socket arm.. http://www.ram-mount.co.uk/double-socket-arm-for-1-ball-p-1009-c-
238_286.html (different length arms are available)
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