Horizon Series I
Grand Rapids Technologies' flag ship. If you intend to fly a lot of IFR, want an integrated avionics panel with maximum system redundancy the Horizon from GRT is for you.
Features of the Horizon EFIS include Garmin radio integration, advanced lateral and vertical autopilot coupling, synthetic approach, dual AHRS with integrity monitoring, reversionary display capability, and more. (Note: subscriptions or additional equipment may be required).
System examples:
Single Horizon-HS display, Single AHRS. $5000
Dual Horizon-HS displays, Dual AHRS, Engine Monitor with probes (H/ENG-LYC-4). $8350
See Pricing Wizard for specific display, AHRS and engine packages.
Options:
Internal GPS
Internal RAIM GPS
XM Weather
ARINC 429
Additional Displays
WS - Wide Format Display
HS - High Resolution Display
HX - Accelerated processor with synthetic vision
Horizon Physical Dimensions:

Overall Size of HS 6.5" Faceplate : 7.1" wide x 5.25 high x 3.75 deep (Panel opening: 6.25" wide x 5.19" high) Weight 3.1 lbs. Most popular size.

Overall Size of HS 8.4" Faceplate : 8.7" wide x 6.47" high x 3.00" deep (Panel opening: 8.064" wide x 6.33" high) Weight 4.2 lbs.

Overall Size of WS Faceplate : 7.25" wide x 4.75" high x 3" deep (Panel opening: 6.25" wide x 4.65" high) Weight 2.2 lbs. Great for smaller panels.
Dual AHRS

Single AHRS
Specifications:
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Max Angular Rate: |
200 degrees/second, all axis simultaneously |
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Pitch and Roll Angles Range: |
Unlimited |
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Operating Temperature Range: |
-15 to +160 deg F ( -25 to +70 deg C) |
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Storage Temperature Range: |
-25 to +185 deg F (-30 to + 85 deg C) |
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Maximum rate of change of temperature: |
Unlimited |
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AHRS Aiding: |
Not required |
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Display: |
Direct sunlight readable, backlit, wide temperature range, Min Backlight intensity : 3 nits. |
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Airspeed Ranges: |
Low speed version is 35-290 mph indicated, and the high speed version is 50-600 mph indicated. |
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Altimeter: |
-1000 to +35,000 feet. Meets IFR accuracy requirements. |
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Magnetic Heading: |
<5 degrees error – gyro-stabilized |