Dynon Avionics SkyView System Installation Guide - Manual (Page 188)

SV-GPS-250 Installation and Configuration
8-2 SkyView System Installation Guide - Revision S
Physical Installation
For most reliable performance, the SV-GPS-250 (like all GPS devices) requires a
clear, unobstructed view of the sky. The SV-GPS-250 is designed to be mounted on
the upper fuselage of the aircraft for an unobstructed (360° view) of the sky during
maneuvers. If the SV-GPS-250 is mounted inside the fuselage (for example, on the
top of the panel), the SV-GPS-250’s view of the sky is partially obstructed, and GPS
performance may be marginal in situations such as insufficient number of
satellites “in view” through the windscreen.
If you are concerned with possible performance issues with the intended
installation location, temporarily install the SV-GPS-250 and verify GPS
functionality - SETUP MENU > LOCAL DISPLAY SETUP > GPS FIX STATUS. Note
SATELLITES IN USE – the more satellites that are in use, the more accurate the GPS
fix can be. Note FIX QUALITY – should be 3D FIX.
The diagram below shows the mounting dimensions of the GPS module. Note that it utilizes a
common bolt pattern found in much of general aviation.
Figure 55 – SV-GPS-250 Mounting Dimensions
Mounting hardware is not included. The SV-GPS-250 is designed to work with #8 fasteners with
100 degree countersunk heads. The use of nut plates is recommended for convenience, but
other hardware can be used if space allows. Specific hardware selection is determined by the
installer.
We recommend you use weather sealant around the fastener heads to keep moisture from
entering the aircraft through the mounting holes. The module itself is sealed and includes a
rubber gasket that seals the inner wire hole. It also allows the module to be mounted on slightly
curved surfaces. For extra protection, you may use weather sealant around the outside of the
SV-GPS-250 module where it meets the skin of the aircraft.