Garmin G1000 Manual

							190-00709-04  Rev. AGarmin G1000 Pilot’s Guide for the Socata TBM 850357
HAZARD AVOIDANCE
At	the	completion	of	a	successful	weather	data	request,	the	request	status	window	(if	still	open)	will	indicate	
‘OK’.
Cancelling a GFDS Weather Data Request in Progress:
1) Select the Weather Data Link (GFDS) Page.
2) Press the MENU Key.
3) With ‘GFDS Data Request’ highlighted, press the ENT Key.
4) Turn the large FMS Knob to select ‘CANCEL REQ’ and press the ENT Key.  The request status box indicates 
‘Request Cancelled’.
5) Press the FMS Knob to return to the GFDS Weather Datalink Page.
The	pilot	 can	schedule	 GFDS	data	requests	 to	recur	 automatically.	 	 Auto	requests	 remain	enabled	 until	the	
pilot	disables	 them,	or	the	 G1000	 power	is	cycled.		 The	Request	 Status	window	 will	indicate	 a	countdown	 timer	
until	the	next	automatic	data	request	occurs.
 NOTE:  If automatic GFDS data requests were enabled prior to the system enterin\
g Reversionary Mode, the 
automatic weather data requests will continue in Reversionary Mode, however the GFDS Data Request 
window and its associated options will not be available.
Enabling/disabling automatic GFDS Data Requests:
1) Select the Weather Data Link (GFDS) Page.
2) Press the MENU Key.
3) With ‘GFDS Weather Request’ highlighted, press the ENT Key.
4) Choose the desired weather coverage options.
5) Turn the large FMS Knob to select the ‘UPDATE RATE’ setting.  Then turn the small FMS Knob to highlight the 
desired automatic update frequency (OFF, 5 Min, 10 Min, 15 Min, 20 Min, 25 Min, 30 Min, 45 Min, or 60 Min), 
then press the ENT Key.
6) The ‘SEND REQ” button is highlighted and a countdown timer is displayed in the ‘REQUEST STATUS’ based on 
the currently selected update rate.  Press the ENT Key to immediately send an immediate GFDS Data Request.
 Or:
        Press the FMS Knob to return to the Weather Data Link (GFDS) Page.  
						

							Garmin G1000 Pilot’s Guide for the Socata TBM 850190-00709-04  Rev. A358
HAZARD AVOIDANCE
WORLDWIDE WEATHER PRODUCTS
PRECIPITATION
 NOTE:  Precipitation data cannot be displayed at the same time as terrain or St\
ormscope.
Precipitation	 (PRECIP)	data	is	not	 real-time.	 	 The	lapsed	 time	between	 collection,	 processing,	 and	
dissemination	 of	radar	 images	 can	be	significant	 and	may	 not	reflect	 the	current	 radar	synopsis.		 Due	to	the	
inherent	delays	and	the	relative	age	of	the	data,	it	should	be	used	for	long-range	planning	purposes	only.	
Figure 6-67  Precipitation Data on the Weather Data Link (GFDS) Page
No Radar Coverage
Boundary of 
Precipitation data 
request
Precipitation	data	can	be	displayed	on	the	following	maps:
•	 PFD
Displaying Precipitation weather information:
1) Select the MAP Softkey (for the PFD Inset Map, select the INSET Softkey).  This step is not necessary on the 
Weather Data Link (GFDS) Page.
2) Press the PRECIP Softkey.
Radar	 data	shown	 represents	 highest	level,	composite	 reflectivity,	 of	radar	 returns.	 	 	 The	display	 of	the	
information	 is	color-coded	 to	indicate	 the	weather	 severity	level.		All	weather	 product	legends	can	be	viewed	
on	 the	 Weather	 Data	Link	 (GFDS)	 Page.		For	the	Precipitation	 legend	(Figure	 6-68),	select	the	LEGEND	Softkey	
when	Precipitation	is	selected	for	display.  
						

							190-00709-04  Rev. AGarmin G1000 Pilot’s Guide for the Socata TBM 850359
HAZARD AVOIDANCE
No Radar Coverage
Figure 6-68  Precipitation Data Legend
Boundary of weather 
data request
The	 display	 of	radar	 coverage	 is	enabled	 active	when	Precipitation	 is	selected	 for	display.	 	 Areas	where	
precipitation	 radar	coverage	 is	not	 currently	 available	or	is	not	 being	 collected	 are	indicated	 in	gray	 shade	
of	purple.	 	 A	white	 boundary	 line	depicting	 the	selected	 coverage	 area	of	the	 GFDS	 weather	 data	request	
encloses the precipitation data when this weather product is displayed.
ReFlectivity
Reflectivity	 is	the	 amount	 of	transmitted	 power	returned	 to	the	 radar	 receiver.		 Colors	on	the	 Precipitation	
display	 directly	 correlate	 to	the	 level	 of	detected	 reflectivity.		 Reflectivity	as	it	relates	 to	hazardous	 weather	
can	be	very	complex.
The	role	of	radar	 is	essentially	 to	detect	 moisture	 in	the	 atmosphere.	 Simply	put,	certain	 types	of	weather		
reflect	 radar	better	 than	others.	 	 The	intensity	 of	a	radar	 reflection	 is	not	 necessarily	 an	indication	 of	the	
weather	 hazard	level.		For	instance,	 wet	hail	 returns	 a	strong	 radar	reflection,	 while	dry	hail	 does	 not.	Both	
wet	and	dry	hail	can	be	extremely	hazardous.
The	 different	 radar	echo	intensities	 are	measured	 in	decibels	 (dB)	relative	 to	reflectivity	 (Z).	 	Weather	
radars measure the reflectivity ratio, or the energy reflected back	 to	the	 radar	 receiver	 (designated	 by	the	
letter	Z).		The	value	of	Z	increases	as	the	returned	signal	strength	increases.
PReciPitatiOn limitatiOns
Radar	images	may	have	certain	limitations:
•	 Radar	 composite	 reflectivity	 does	not	provide	 sufficient	 information	 to	determine	 precipitation	
characteristics	 (wet	hail	vs.	rain).		 For	example,	 it	is	 not	 possible	 to	distinguish	 between	wet	snow,	 wet	
hail, and rain.
•	 The	 radar	beam	 may	overshoot	 precipitation	 occurring	below	the	lowest	 antenna	 beam	tilt	angle	 (0.5°),	
causing	 no	precipitation	 to	be	 displayed.		 An	individual	 radar	site	cannot	 depict	high	altitude	 storms	at	
close	ranges.		It	has	no	information	about	storms	directly	over	the	radar	site.
•	 When	 zoomed	in	to	a	range	 of	30	 nm,	 each	 square	 block	on	the	 display	 represents	 an	area	 of	four	 square	
kilometers.  
						

							Garmin G1000 Pilot’s Guide for the Socata TBM 850190-00709-04  Rev. A360
HAZARD AVOIDANCE
Figure 6-69  Precipitation Data - Zoomed 
Block represents4 km2
The	following	may	cause	abnormalities	in	displayed	radar	images:
•	 Ground	clutter
•	 Strobes	and	spurious	radar	data
•	 Sun	strobes	(when	the	radar	antenna	points	directly	at	the	sun)
•	 Interference	from	buildings	or	mountains,	which	may	cause	shadows
•	 Metallic	dust	from	military	aircraft,	which	can	cause	alterations	in	radar	scans  
						

							190-00709-04  Rev. AGarmin G1000 Pilot’s Guide for the Socata TBM 850361
HAZARD AVOIDANCE
INFRARED SATELLITE
Infrared	Satellite	(IR	SAT)	 data	(Figure	 6-70)	depicts	 cloud	top	temperatures	 from	satellite	 imagery.		 Brighter	
cloud top colors indicate cooler temperatures occurring at higher altitudes.
Figure 6-70  METAR Flags on the Weather Data Link Page
Displaying Cloud Tops information:
1) Select the Weather Data Link (GFDS) Page.
2) Press the IR SAT Softkey.
To	display	 the	Infrared	 Satellite	legend	(Figure	 6-71),	select	the	LEGEND	Softkey	 when	Infrared	 Satellite	data	
is selected for display. 
Figure 6-71  Infrared Satellite Legend  
						

							Garmin G1000 Pilot’s Guide for the Socata TBM 850190-00709-04  Rev. A362
HAZARD AVOIDANCE
DATALINK LIGHTNING
Datalink	Lightning	 (DL	LTNG)	 data	(Figure	 6-72)	shows	 the	approximate	 location	of	cloud-to-ground	
lightning	 strikes.		A	strike	 icon	represents	 a	strike	 that	has	occurred	 within	a	two-kilometer	 region.		Neither	
cloud-to-cloud	nor	the	exact	location	of	the	lightning	strike	is	displayed.
If	the	 aircraft	 is	also	 equipped	 with	the	L-3	 WX-500	 Stormscope®,	only	 one	lightning	 product	may	be	
enabled	for	display	at	a	time.
Figure 6-72  Datalink Lightning
Areas of 
Lightning Strikes
Datalink	Lightning	data	displayed	on	the	following	maps:
•	 PFD
Displaying Datalink Lightning information:
1) Press the MAP Softkey (for the PFD Inset Map, select the INSET Softkey).  This step is not necessary on the 
Weather Data Link (GFDS) Page.
2) Press the DL LTNG Softkey.
To	 display	 the	Datalink	 Lightning	 legend	on	the	 Weather	 Data	Link	 (GFDS)	 Page	(Figure	 6-73),	select	the	
LEGEND	Softkey	when	Datalink	Lightning	is	selected	for	display.
Figure 6-73  Datalink Lightning Legend  
						

							190-00709-04  Rev. AGarmin G1000 Pilot’s Guide for the Socata TBM 850363
HAZARD AVOIDANCE
SIGMETS AND AIRMETS
SIGMETs		(SIGnificant	METeorological	 Information)	and AIRMETs	(AIRmen’s	METeorological	 Information)	
are	issued	 for	potentially	 hazardous	weather.	 	A	Convective	 SIGMET	is	issued	 for	hazardous	 convective	
weather	such	as	severe	 or	widespread	 thunderstorms.		 A	localized	 SIGMET	can	be	displayed	 when	significant	
weather conditions are not widespread.
The	entire	 SIGMET	 or	AIRMET	 is	displayed	 as	long	 as	any	 portion	 of	it	is	 issued	 within	 the	coverage	 area	
of	the	GFDS	data	request.
Figure 6-74  SIGMET/AIRMET Data
SIGMET
Displaying SIGMETs and AIRMETs:
1) Select the Weather Data Link (GFDS) Page.
2) Press the SIG/AIR Softkey.
3) To view the text of the SIGMET or AIRMET, press the RANGE Knob and move the Map Pointer over the icon.
4) Press the ENT key.  Figure 6-75 shows sample SIGMET text.
To	display	 the	SIGMET	 and	AIRMET	 legend	(Figure	 6-76),	select	the	LEGEND	Softkey	 when	SIGMETs	 and	
AIRMETs	are	selected	for	display.	  
						

							Garmin G1000 Pilot’s Guide for the Socata TBM 850190-00709-04  Rev. A364
HAZARD AVOIDANCE
Figure 6-76  SIGMET/AIRMET LegendFigure 6-75  Sample SIGMET Text
METARS AND TAFS
 NOTE:  METAR information is only displayed within the installed aviation database \
service area.
METARs	 (METeorological	 Aerodrome	Reports)	typically	contain	information	 about	the	temperature,	
dewpoint,	 wind,	precipitation,	 cloud	cover,	 cloud	base	heights,	 visibility,	 and	barometric	 pressure	at	an	
airport	 or	observation	 station.	They	can	also	 contain	 information	 on	precipitation	 amounts,	lightning,	 and	
other	critical	 data.		METARs	 reflect	hourly	 observations;	 non-routine	updates	include	the	code	 “SPECI”	 in	the	
report.   METARs	are	shown	as	colored	flags	at	airports	that	provide	them.
Figure 6-77  METAR Flags on the Weather Data Link (GFDS) Page
Instructions 
for Viewing 
METAR and  TAF Text
Selected Airport  
						

							190-00709-04  Rev. AGarmin G1000 Pilot’s Guide for the Socata TBM 850365
HAZARD AVOIDANCE
TAFs	(Terminal	 Aerodrome	 Forecasts)	are	weather	 predictions	 for	specific	 airports	 within	a	24-	 hour	 period,	
and	may	 span	 up	to	36	 hours.		 TAFs	typically	 include	forecast	 wind,	visibility,	 weather	phenomena,	 and	sky	
conditions	using	METAR	codes.
METAR	 and	TAF	 text	are	displayed	 on	the	 Weather	 Information	 Page.		TAF	information	 is	displayed	 in	its	
raw	form	when	it	is	available.
Displaying METAR and TAF text:
1) On the Weather Data Link (GFDS) Page, select the METAR Softkey.
2) Press the RANGE Knob and pan to the desired airport.
3) Press the ENT Key.  The Weather Information Page is shown with METAR and TAF text.
4) Use the FMS Knob or the ENT Key to scroll through the METAR and TAF text.  METAR text must be completely 
scrolled through before scrolling through the TAF text.
5) Press the FMS Knob or the CLR Key to return to the Weather Data Link (GFDS) Page.
 Or:
1) Select the Weather Information Page.
 a) Turn the large FMS Knob to select the Waypoint Page Group.
 b) Select the WX Softkey to select the Weather Information Page.
2) Press the FMS Knob to display the cursor.
3) Use the FMS Knob to enter the desired airport and press the ENT Key.
4) Use the FMS Knob or the ENT Key to scroll through the METAR and TAF text.  Note that the METAR text must 
be completely scrolled through before scrolling through the TAF text.
TAF 
Text
METAR 
Symbol
Figure 6-78  METAR and TAF Text
METAR 
Text  
						

							Garmin G1000 Pilot’s Guide for the Socata TBM 850190-00709-04  Rev. A366
HAZARD AVOIDANCE
Raw	METAR	 text	is	also	 accessible	 while	panning	 the	map	 cursor	 over	a	METAR	 flag	on	any	 map	 page	 on	
which	a	METAR	is	displayed.		The	METAR	text	is	shown	in	a	box	near	the	METAR	flag.
In	addition,	 METAR	flags	and	their	 associated	 text	are	displayed	 on	the	 Active	 Flight	Plan	Page	 on	the	 MF.D.		
The	system	shows	a	METAR	flag	next	to	waypoints	in	the	flight	plan	with	an	available	METAR.	
Displaying raw METAR text on the Active Flight Plan Page:
1) Select the Active Flight Plan Page on the MFD.
2) Press the FMS Knob to activate the cursor.
3) Turn the large FMS Knob to highlight a waypoint with an available METAR (indicated with a METAR flag next 
to it).  The METAR text will appear in the ‘SELECTED WAYPOINT WEATHER’ window below. 
4) When finished, press the FMS Knob to remove the cursor or press the FPL Key to exit the Active Flight Plan 
Page.
To	display	 the	METAR	 legend	on	the	 Weather	 Data	Link	 (GFDS)	 Page	(Figure	 6-79),	select	the	LEGEND 
Softkey	when	METARs	are	selected	for	display.
The	METAR	 flag	color	 is	determined	 by	the	 information	 in	the	 METAR	 text.		A	gray	 METAR	 flag	is	displayed	
when	the	METAR	text	does	not	contain	adequate	information.
Figure 6-79  METAR Legend
WINDS ALOFT
Winds	 Aloft	data	(Figure	 6-80)	shows	 the	forecasted	 wind	speed	 and	direction	 at	the	 surface	 and	at	selected	
altitudes.	Altitude	can	be	displayed	in	3,000-foot	increments	up	to	42,000	feet	MSL.
Displaying Winds Aloft  data:
1) Select the Weather Data Link (GFDS) Page.
2) Press the MORE WX Softkey.
3) Press the WIND Softkey.
4) Select the desired altitude level: SFC (surface) up to 42,000 feet.  Select the NEXT or PREV Softkey to cycle 
through the altitude softkeys.  The WIND Softkey label changes to reflect the altitude selected.