I like this site: http://gpsinformation.net/allory/garfeat3.htm (Allory Deiss). He maintains a list of firmware updates for many models. One advantage of this site is that the dates of the firmware releases seem to be kept in his log historically and, for example, Garmin appear to delete that date info.

Here it is as of today (with the v3.20 from the 920XT to be added methinks 🙂 )

Recent Additions:

fenix3 v. 3.10

Dash Cam 10/Dash Cam 20 v. 3.50

vivoactive v. 2.60

zumo 590 v. 3.10

GPSMAP 62/78 v. 6.10

nuvi 2798 v. 4.80

RV and Camper 760 v. 4.80

nuvi 35×7 and 35×8 v. 4.80

nuvi 27×7 and 27×8 v. 4.80

nuvi 2xx7 and 2xx8 v. 4.80

aera 5xx v. 5.30

GPSMAP 695/696 v. 7.20

Astro 320 v. 4.30

Forerunner 610 v. 3.00

Edge 810 v. 3.45 beta

Edge 510 v. 3.45 beta

dezl 770 v. 3.20

dezl 570 v. 3.20

nuvi 27×9 v. 7.30

nuvi 26×9 v. 7.30

nuvi 25×9 v. 7.30

nuvi 2xx7 and 2xx8 C4 v. 7.30

nuvi 26×9 C4 v. 7.30

nuvi 25×9 C4 v. 7.30

Forerunner 920XT v. 3.07 beta

nuvi 67/68 v. 3.30

nuvi 57/58 v. 3.30

Carmax 310A v. 2.80

vivosmart v. 3.10

Nuvi 55/56 v. 4.30

Nuvi 65/66 v. 4.30

Edge 1000 v. 2.80

VIRB v. 4.00

vivofit2 v. 2.10

vivofit v. 3.70

Approach S6 v. 3.10

Forerunner 15 v. 2.50

GLO v. 2.70

Alpha 100 v. 4.50

fleet 670 v. 3.20

fleet 660 v. 3.20

VIRB Edit for Windows v. 2.9.2

fenix2 v. 4.40

GPSMAP 64 v. 3.70

VIRB Edit for Mac v. 2.9.1

HomePort for Windows v. 2.2.9

HomePort for Mac v. 2.2.9

Oregon 6×0 v. 4.40

eTrex 20/30 v.4.20

Forerunner 620 v. 3.20

dezl 760 v. 5.00

Vector v. 2.71

Vector S v. 2.71

Montana v. 6.40

GPSMAP 62sc/stc v. 4.80

Monterra Outdoor Software v. 1.26

BaseCamp for Mac v. 4.4.6

BMW Motorrad Navigator V v. 3.00

BaseCamp for Windows v. 4.4.6

zumo 3×0 v. 3.90

vivoki v. 1.80

Forerunner 220 v. 3.10

T 5, TT 15 v. 2.50

Rino6xx v. 4.10

dezl 560 v. 3.80

fenix/D2/tactix v. 4.80

Approach G7 v. 2.40

Approach G8 v. 2.50

MapInstall and MapManager for the Mac software v. 4.1.1

Approach G6 v. 3.40

Garmin Dash Cam Player for Mac v. 1.50

fleet 590 v. 4.40

nuvi x2 and x4 v. 4.00

nuvi 40 and 50 v. 4.00

Dash Cam Player v. 4.40

Monterra v. 3.50

zumo 660 v. 5.10

zumo 665 v. 3.10

aera 7xx v. 4.50

GPSMAP 396 v. 5.70

GPSMAP 496 v. 4.80

Garmin Communicator Plugin v. 4.2.0

Garmin Communicator Plugin v. 4.2.0 for Mac

HUD v. 2.20

Edge Touring v. 2.70

DC20/30/40 v. 4.10

nuvi 34xx v. 8.20

nuvi 35xx v. 8.20

nuvi 24×5 and 25×5 v. 8.20

nuvi 140/150 v. 8.20

nuvi 2495 LT GLONASS v. 8.20

nuvi 30 v. 3.80

Approach S4 v. 2.60

Approach S3 v. 2.90

Approach S2 v. 2.60

Oregon x50 v. 6.60

Forerunner 110 v. 2.70

Forerunner 210 v. 2.70

DC 50 v. 2.40

quatix v. 2.50

Express Fit v. 2.0.1

POI Loader for Mac v. 2.3.0

Forerunner 10 v. 2.40

Edge 800 v. 2.70

POI Loader for Windows v. 2.7.3

MapInstall v. 4.0.4

Express Fit for Mac v. 2.0

TT 10 v. 2.70

Dakota v. 5.80

nuvi 24xx v. 3.60

eTrex 10 v. 3.20

Nordic Rino650 v. 2.50

Forerunner 910XT v. 3.00

Edge 500 v. 3.30

UAT-1817 v. 3.52

Garmin Swim v. 3.60

GPSMAP 296 v. 6.10

GPSMAP 495 v. 2.80

nuvi 465T v. 4.20

ANT Agent for Mac v. 2.2.2

ANT Agent v. 2.3.4 for Windows

GTMxx Traffic Receiver Type 3 v. 3.10

Forerunner 310XT v. 4.50

nuvi 200W v. 4.10

nuvi 250W v. 4.10

nuvi 200 v. 5.10

nuvi 250 v. 5.10

nuvi 260 v. 5.10

nuvi 270 v. 5.10

nuvi 22xx v. 3.70

nuvi 23xx v. 3.70

nuvi 12xx v. 6.20

nuvi 13xx and 14xx v. 6.20

nuvi 12xx (MTK) v. 6.20

nuvi 13xx and 14xx (MTK) v. 6.20

Rino 520HCx/530HCx v. 3.40

nuvi 37xx v. 5.00

Forerunner 410 v. 2.30

nuLink 23xx v. 3.30

nuvi 7×5 v. 4.50

zumo 4xx/5xx v. 5.00

nuvi 7xx v. 5.40

USB Drivers v. 2.3.1

GPS 72H v. 2.80

zumo 2X0 v. 3.00

WebUpdater (Windows XP SP3 and newer) v. 2.5.6

nuLink 1695 v. 3.20

Approach S1 v. 2.70

nuvi 2×5 v. 7.60

nuvi 2x5W v. 7.60

WebUpdater for Mac v. 2.1.3

Approach G6 Golf Viewer v. 2.00

Training Center For Macintosh v. 3.2.1.1 beta

Edge 200 v. 2.10

Foretrex 301/401 v. 2.60

nuvi 5xx v. 4.30

Training Center For Windows v. 3.6.5

Approach G5 v. 3.70

Astro 220/DC20 v. 3.70

Approach G3 v. 2.50

GTU 10 US v. 2.40

GTU 10 EU v. 2.60

GTU 10 CA v. 2.60

Forerunner 405 v. 2.80

Forerunner 405CX v. 2.40

GPSMAP 6×0 v. 3.70

Colorado 300 v. 3.70

Colorado 400t v. 3.70

Colorado 400i v. 3.70

Colorado 400c v. 3.70

Oregon v. 4.20

nuvi 16xx v. 3.90

GPSMAP 196 v. 4.60

GPSMAP 96 v. 3.00

GPSMAP 96C v. 3.00

FR60 v. 2.70

Edge 605/705 v. 3.30

MapSource v. 6.16.3

eTrex Vista v. 3.90

Geko 201 v. 2.90

eTrex H v. 3.40

nuvi 610 v. 4.90

nuvi 660 v. 4.90

MapConverter for Windows v. 2.1.1

G60 nuvifone – Sunrise v. 5.11

Mobile PC v. 5.00.70

G60 nuvifone – Atlantic v. 6.13

nuvi 310 v. 5.20

nuvi 360 v. 5.20

nuvi 370 v. 5.20

nuvi 300 v. 6.20

nuvi 350 v. 6.20

nuvi 885 v. 4.70

nuvi 865 v. 4.70

nuvi 855 v. 4.70

nuvi 880 v. 4.70

nuvi 860 v. 4.70

nuvi 850 v. 4.70

BMW Motorrad Navigator IV v. 3.50

eTrex Venture Cx v. 3.40

eTrex Legend Cx v. 3.40

eTrex Vista Cx v. 3.40

eTrex Legend HCx v. 3.20

eTrex Vista HCx v. 3.20

eTrex Venture HC v. 3.30

eTrex Summit HC v. 3.30

StreetPilot c510 v. 6.70

StreetPilot c530 v. 6.70

StreetPilot c550 v. 6.70

StreetPilot c580 v. 6.70

GPSMAP 76CSx v. 4.00

GPSMAP 76Cx v. 4.00

GPSMAP 60CSx v. 4.00

GPSMAP 60Cx v. 4.00

Mobile XT for Symbian S60 v. 5.00.50

Forerunner 305 v. 2.90

Forerunner 205 v. 2.90

GTMxx Traffic Receiver v. 5.50

Rino 120 v. 5.90

Rino 130 v. 5.90

RoadTrip for Mac v. 2.0.2

nuvi 900T v. 3.60

GDBxx MSN Direct Receiver v. 3.30

Mobile XT for Symbian UIQ3.0 v. 5.00.20

iQue 3600a – Release 3

GPS V v. 2.60

StreetPilot 7200 v. 5.30

StreetPilot 7500 v. 5.30

Mobile XT for Windows Mobile Ver. 5.00.20w

nuvi 5000 v. 4.10

Mobile XT for Palm OS with GPS 10x v. 5.00.10p

Mobile XT for Palm v. 5.00.10p

StreetPilot c310 v. 6.10

StreetPilot c320 v. 6.10

StreetPilot c330 v. 6.10

StreetPilot c340 v. 6.10

Project Bobcat v. 2.0.0.8 Beta

GPS 72 v. 2.50

Quest 2 v. 3.10

eTrex Legend v. 3.90

eTrex Venture/Mariner v. 5.20

StreetPilot 2720 v. 7.20

StreetPilot 2730 v. 7.20

StreetPilot 2820 v. 4.40

BMW Motorrad Navigator III v. 4.40

and so the list continues …. go to the original site for more http://gpsinformation.net/allory/garfeat3.htm

Thank you Allory !