Garmin gns 420w Manuale Utente

1

190-00356-01 Rev E

 

CAUTION: The Global Positioning System is operated by the 

United States government, which is solely responsible for its 

accuracy and maintenance. The system is subject to changes 

which could affect the accuracy and performance of all GPS 

equipment. Although the Garmin 400W-series are precision 

electronic NAVigation AIDs (NAVAID), any NAVAID can be 

misused or misinterpreted and therefore become unsafe. 

 

CAUTION: Use the 400W-series at your own risk. To reduce the 

risk of unsafe operation, carefully review and understand all 

aspects of this Owner’s Manual and the Flight Manual Supple-

ment, and thoroughly practice basic operation prior to actual 

use. When in actual use, carefully compare indications from the 

400W-series to all available navigation sources, including the 

information from other NAVAIDS, visual sightings, charts, etc. 

For safety, always resolve any discrepancies before continuing 

navigation. 

 

WARNING: The altitude calculated by the 400W-series 

is geometric height above mean sea level and could vary 

significantly from altitude displayed by pressure altimeters in 

aircraft. 

 

WARNING: The Jeppesen database incorporated in the 

400W-series must be updated regularly in order to ensure 

that its information is current. Updates are released every 

28 days. A database information packet is included in your 

400W-series package. Pilots using an out-of-date database 

do so entirely at their own risk! 

 

CAUTION: GPS receivers operate by receiving and decod-

ing very low power radio signals broadcast by satellites. It 

is possible that in some situations other radio equipment 

or electronic equipment used in close proximity to a GPS 

receiver may create electromagnetic interference (EMI) which 

may affect the ability of the GPS receiver to receive and 

decode the satellite signals. In such event, the interference 

may be reduced or eliminated by switching off the source of 

interference or moving the GPS receiver away from it. 

 

WARNING: VNAV is to be used for advisory purposes only.  

VNAV messages or vertical speed required should not be 

used to maintain terrain or ATC clearances.  Terrain and ATC 

clearances are the sole responsibility of the pilot. 

 

CAUTION: The electronic chart is an aid to navigation and 

is designed to facilitate the use of authorized government 

charts, not replace them. Land and water data is provided 

only as a general reference to your surroundings. The posi-

tional accuracy of the land and water data is not of a preci-

sion suitable for use in navigation and it should not be used 

for navigation. Only official government charts and notices 

contain all information needed for safe navigation – and, as 

always, the user is responsible for their prudent use. 

 

CAUTION: The Terrain feature is for supplemental awareness 

only. The pilot/crew is responsible for all terrain and obstacle 

avoidance using information not provided by the 400W-series 

Terrain feature. 

 

CAUTION: The Garmin 400W-series does not contain any 

user-serviceable parts. Repairs should only be made by an 

authorized Garmin service center. Unauthorized repairs or 

modifications could void your warranty and authority to 

operate this device under FCC Part 15 regulations. 

 

NOTE:  The GNS 400W-series units use a different database 

than in the legacy units. The databases are incompatible 

between units. The GNS 400W-series units must use a  WAAS 

enabled database. 

 

NOTE:  This product, its packaging, and its components 

contain chemicals known to the State of California to cause 

cancer, birth defects, or reproductive harm. This notice is be-

ing provided in accordance with California’s Proposition 65. If 

you have any questions or would like additional information, 

please refer to our website at www.garmin.com/prop65. 

 

NOTE: It is the pilot’s responsibility for initial missed ap-

proach guidance in accordance with published procedure. The 

unit may not provide correct guidance until established on a 

defined leg. 

 

NOTE:  GPS level of service annunciations (LPV, ENR, etc.) 

are not applicable to the external CDI (or HSI) when VLOC is 

active.