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190-00880-00 

GPS 20x Technical Specifications  

Rev. A 

Page 11 

APPENDIX A: EARTH DATUM LIST 

The following is a list of the Garmin GPS 20x Earth datum indices and the corresponding earth datum name 
(including the area of application): 

ADINDAN–Ethiopia, Mali, Senegal, Sudan 

AUSTRALIAN GEODETIC 1984–Australia, Tasmania Island 

10 

ASTRO DOS 71/4–St. Helena Island 

11 

ASTRONOMIC STATION 1952–Marcus Island 

12 

ASTRO B4 SOROL ATOLL–Tern Island 

13 BELLEVUE 

(IGN)–Efate 

and Erromango Islands 

14 

BERMUDA 1957–Bermuda Islands 

15 BOGOTA 

OBSERVATORY–Colombia 

16 CAMPO 

INCHAUSPE–Argentina 

17 

CANTON ASTRO 1966–Phoenix Islands 

18 

CAPE CANAVERAL–Florida, Bahama Islands 

19 CAPE–South 

Africa 

20 CARTHAGE–Tunisia 

21 

CHATHAM 1971–Chatham Island (New Zealand) 

22 CHUA 

ASTRO–Paraguay 

23 CORREGO 

ALEGRE–Brazil 

24 

DJAKARTA (BATAVIA)–Sumatra Island (Indonesia) 

25 

DOS 1968–Gizo Island (New Georgia Islands) 

26 

EASTER ISLAND 1967–Easter Island 

27 EUROPEAN 

1950–Austria, Belgium, Denmark, Finland, France, Germany, Gibraltar, Greece, Italy, 

Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland 

28 

EUROPEAN 1979–Austria, Finland, Netherlands, Norway, Spain, Sweden, Switzerland 

29 

FINLAND HAYFORD 1910–Finland 

30 

GANDAJIKA BASE–Republic of Maldives 

31 

GEODETIC DATUM 1949–New Zealand 

32 

ORDNANCE SURVEY OF GREAT BRITAIN 1936–England, Isle of Man, Scotland, Shetland Islands, 
Wales 

33 GUAM 

1963–Guam 

Island 

34 

GUX 1 ASTRO–Guadalcanal Island 

35 HJORSEY 

1955–Iceland 

36 

HONG KONG 1963–Hong Kong 

37 INDIAN–Bangladesh, 

India, 

Nepal 

38 INDIAN–Thailand, 

Vietnam 

39 IRELAND 

1965–Ireland 

40 

ISTS O73 ASTRO 1969–Diego Garcia 

41 

JOHNSTON ISLAND 1961–Johnston Island 

42 KANDAWALA–Sri 

Lanka 

43 KERGUELEN 

ISLAND–Kerguelen 

Island 

Summary of Contents for GPS 20x

Page 1: ...GPS 20x TECHNICAL SPECIFICATIONS Garmin International Inc 1200 E 151st Street Olathe KS 66062 USA 190 00880 00 Revision A January 2008 a...

Page 2: ...print one copy of this manual or of any revision hereto provided that such electronic or printed copy of this manual must contain the complete text of this copyright notice and provided further that a...

Page 3: ...1 5 3 4 Accuracy 5 1 5 4 Interfaces 5 1 5 4 1 GPS 20x Electrical Characteristics 5 1 5 4 2 Garmin Interface and Garmin USB Protocol 5 2 Mechanical Characteristics Mounting 6 3 GPS 20x Software Interfa...

Page 4: ...ation of this device is subject to the following conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cau...

Page 5: ...ABLE FOR ANY INCIDENTAL SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT Some states do not allow the exc...

Page 6: ...application designer The GPS 20x interfaces to a computer with an available USB port Drivers are available for use on Windows computers Macintosh and Linux drivers are not available from Garmin After...

Page 7: ...2 1 Input Voltage 4 4 5 5 Vdc 1 5 2 2 Input Current 110 mA 5 0 Vdc 1 5 2 3 GPS Receiver Sensitivity 185 dBW minimum 1 5 2 4 Environmental Characteristics Operating Temperature 30 C to 80 C 22 F to 176...

Page 8: ...vice Interface SDK for information about the Garmin Interface and the Garmin USB Protocol At the time of this printing this document is located on the Garmin Web site at www garmin com support commPro...

Page 9: ...TICS 1 7 in 42 8 mm 1 3 in 32 4 mm Figure 1 GPS 20x Top Case Dimensions 1 7 in 42 8 mm 0 5 in 12 mm Figure 2 GPS 20x Side View 0 5 in 12 mm Figure 3 GPS 20x End View 190 00880 00 GPS 20x Technical Spe...

Page 10: ...tted by the GPS 20x using Spanner an application that can provide NMEA output via a virtual COM port Spanner is available for free on the Garmin web site To download the software start at www garmin c...

Page 11: ...3851 3651 N 09447 9382 W 000 0 221 9 081103 003 3 E 67 GPRMC 000000 A 3851 3651 N 09447 9382 W 000 0 221 9 081103 003 3 E 67 GPRMC 000001 A 3851 3651 N 09447 9382 W 000 0 221 9 081103 003 3 E 66 If a...

Page 12: ...will be transmitted Note Items 4 5 6 and 7 repeat for each satellite in view to a maximum of four 4 satellites per sentence GSV will be repeated as necessary to output all satellites in view up to 12...

Page 13: ...lity 3 No Effect This field is not used on this model and is included only for backwards compatibility 4 No Effect This field is not used on this model and is included only for backwards compatibility...

Page 14: ...2 CHUA ASTRO Paraguay 23 CORREGO ALEGRE Brazil 24 DJAKARTA BATAVIA Sumatra Island Indonesia 25 DOS 1968 Gizo Island New Georgia Islands 26 EASTER ISLAND 1967 Easter Island 27 EUROPEAN 1950 Austria Bel...

Page 15: ...60 NORTH AMERICAN 1927 Caribbean Barbados Caicos Islands Cuba Dominican Republic Grand Cayman Jamaica Leeward Islands Turks Islands 61 NORTH AMERICAN 1927 Mean Value CONUS 62 NORTH AMERICAN 1927 Cuba...

Page 16: ...Falkland Island 90 SCHWARZECK Namibia 91 SOUTHEAST BASE Porto Santo and Madeira Islands 92 SOUTHWEST BASE Faial Graciosa Pico Sao Jorge and Terceira Islands Azores 93 TIMBALAI 1948 Brunei and East Mal...

Page 17: ...mmand base 10 Position Record On 49 Position Record Off 50 Note that the satellite data information is also enabled when the position record is enabled USB packets contain a header with a USB transpor...

Page 18: ...cpo_sat_data The status bit field represents a set of booleans described below Bit Meaning when bit is one 1 0 The unit has ephemeris data for the specified satellite 1 The unit has a differential co...

Page 19: ...ians lon_vel Longitude velocity meters second lat_vel Latitude velocity meters second alt_vel Altitude velocity meters second msl_hght Height mean sea level meters leap_sec UTC leap seconds grmn_days...

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