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Maidenhead Locator System

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170: 274:. These are encoded into a second pair of letters, which should be presented in uppercase, but are sometimes (incorrectly) presented in lowercase as a legacy from the old QRA. The error has unfortunately been incorporated into various software packages, several examples of which can be seen on this page. Again, to make manual calculations from degrees and minutes easier, 24 was chosen as the base number, giving these subsquares dimensions of 2.5' of latitude by 5' of longitude. The letters used are "A" through "X". 258: 208: 269:
and placed after the first pair of letters, uses a base number of 10, and is encoded using the digits "0" to "9". This is where the alternative name "grid squares" comes from. Each of these squares represents 1° of latitude by 2° of longitude. For additional precision, each square can optionally be
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into even smaller ones with dimensions 15" of latitude by 30" of longitude. Such precision has uses in very short communication spans. Beyond this, no common definition exists to extend the system further into even smaller squares. Most often the extending is done by repeating alternating
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of the Maidenhead locator system in 1999, operators had usually specified their location based on their local national datum. Consequently, stations very near the edges of squares (at denoted precision) may have changed their locators when changing over to the use of WGS 84.
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In each pair, the first character encodes longitude and the second character encodes latitude. These character pairs also have traditional names, and in the case of letters, the range of characters (or "encoding base number") used in each pair does vary.
293:. Two points within the same Maidenhead subsquare are always less than 10.4 km (6.5 mi) apart, which means a Maidenhead locator can give adequate precision from only six easily transmissible characters. 425:
narrowband digital mode transmits Maidenhead locator square as part of standard messages, with the 4 character locator square being efficiently represented within 15 bits of the transmitted string.
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was initially discouraged, as it caused confusion with the older QRA locator system. The only abbreviation recommended to indicate a Maidenhead reference in Morse code and radio teleprinter transmission was
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Earth. This results in a small error in distance, but makes calculations simpler and, given the inherent imprecision in the input data used, it is not the biggest error source. Until the adoption of
139:, typically 1 point per kilometre, so there is a need for amateurs to exchange their locations over the air. To facilitate this, following the growth of the sport in the 1950s, the German 254:—was chosen to be 18, thus dividing the globe into 18 zones of longitude of 20° each, and 18 zones of latitude 10° each. These zones are encoded with the letters "A" through "R". 143:
system was adopted in 1959. The QRA locator system was limited to describing European coordinates, and by the mid-1970s there was growing need for a global locator system.
150:, England, the VHF Working Group had received twenty different proposals to replace the QRA locator grid. That devised by John Morris (G4ANB) was deemed to be the best. 433:
clarified the latest position on use of the IARU locator at various levels of precision, including a fifth pair of characters and that all letters should be uppercase.
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language routines to convert from locator references to geographical coordinates (latitude and longitude) for further processing. A complete program in BASIC called
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or GEOREF. This position information is presented in a limited level of precision to limit the number of characters needed for its transmission using voice,
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Conference in Lillehammer it was decided that the latitude and longitude to be used as a reference for the determining of locators should be based on the
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subsquare and square rules (base numbers 24 and 10 respectively). However, other bases for letter encodings have also been observed, and therefore such
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Like the QRA system before it, Maidenhead locators were enthusiastically adopted by radio amateurs beyond contesting, and it is now in widespread use.
356:(The fifth and subsequent pairs are not formally defined, but recursing to the third and fourth pair algorithms is a possibility, e.g.: BL11BH16OO66) 277:
The resulting Maidenhead subsquare locator string is hence composed of two letters, two digits, and two more letters. To give an example, W1AW, the
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Talbot, Andy, G4JNT (16–23 September 2017). "Clarification and extension of the IARU locator system". In Green, Dennis, ZS4BS (ed.).
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supports conversion between geographical coordinates and Maidenhead locators in module Ham::Locator by Andy Smith, available on
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Region 1 rules, VHF distance calculations are carried out between Maidenhead subsquare centres, assuming a
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C# class to convert between geographic coordinates and Maidenhead locators, including distance calculation
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To avoid negative numbers in the input data, the system specifies that latitude is measured from the
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Many other utilities exist to convert latitude and longitude to locators, as this is a favourite
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amateur radio contests and as the basis of earning awards like the American Radio Relay League's
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Overbeck, Wayne (December 1986). "A universal grid-locator program for your personal computer".
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For even more precise location mapping, two additional digits were proposed and ratified as an
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To simplify manual encoding, the base for the first pair of letters—traditionally called a
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Maidenhead locators are still used as part of the formulas for scoring in many
232: 1108:"An explanation of the [Maidenhead] system and how it came into being" 257: 1602: 1573: 1529: 121: 36: 1300: 1277: 1095: 449:
was made available the following year by ARRL for a nominal cost of US$ 3.
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The chosen coding uses alternating pairs of letters and digits, like so:
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The Python maidenhead module is on pypi.org for installation via pip.
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into a short string of characters, which is similar in concept to the
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In 1985, the Radio Society of Great Britain published a small set of
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originally devised the system and it was adopted at a meeting of the
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Region 1. pp. 42–45, 33–34. Appendix A, paper LA17 C5 17
586: 1512: 1400: 1379: 1205: 240: 1079:"Click on the checkbox in upper right corner menu to activate." 1266: 410: 726: 442: 786:. 24th IARU Region 1 General Conference. Landshut, DE: 1425: 461: 457: 300:, making it altogether eight characters long, and dividing 1063: 1049:"View full dynamic Maidenhead locator grid in Google Maps" 1048: 391: 132: 128: 780:
Report of the 24th IARU Region 1 General Conference
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The world is divided into 324 (18Ă—18) Maidenhead fields.
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grid square for any location or amateur radio call sign
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Maidenhead locators are also commonly referred to as
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Many commercially available general purpose (civil)
1135:"Generate a KML file that outlines a grid position" 927:"GPS units that support the Maidenhead grid system" 614: 612: 610: 1161: 1057:Click on the control in the map area to activate. 664: 371:precision is used. At high microwave frequencies 345:) encodes with base 24 and the letters "A" to "X". 331:) encodes with base 18 and the letters "A" to "R". 74:, although the "squares" are distorted on any non- 765:https://www.rsgbcc.org/vhf/VHF_Handbook_V6_12.pdf 352:) encodes with base 10 and the digits "0" to "9". 338:) encodes with base 10 and the digits "0" to "9". 146:By the time of their April 1980 meeting, in 1600: 983:Containing all 32,400 Maidenhead Locator Squares 607: 436: 55:and other adverse transmission conditions. The 59:can describe locations anywhere in the world. 1190: 456:for programmers who are also radio amateurs. 950:: CS1 maint: multiple names: authors list ( 851:: CS1 maint: multiple names: authors list ( 808:: CS1 maint: multiple names: authors list ( 746:: CS1 maint: multiple names: authors list ( 698:: CS1 maint: multiple names: authors list ( 644:: CS1 maint: multiple names: authors list ( 560:: CS1 maint: multiple names: authors list ( 164: 223:, and longitude measured eastward from the 1197: 1183: 954:) CS1 maint: numeric names: authors list ( 924: 855:) CS1 maint: numeric names: authors list ( 812:) CS1 maint: numeric names: authors list ( 750:) CS1 maint: numeric names: authors list ( 702:) CS1 maint: numeric names: authors list ( 648:) CS1 maint: numeric names: authors list ( 564:) CS1 maint: numeric names: authors list ( 135:are often scored based on the distance of 531: 261:Fields are divided into 100 squares each. 869: 256: 206: 168: 1017:ARRL Amateur Radio Map of North America 527: 525: 363:frequencies, positions are reported at 39:operators to succinctly describe their 1601: 1163:"View Maidenhead grid on Google Earth" 826: 776: 398:, URE TTLOC, etc. operating contests. 1178: 716: 663:Tyson, Edmund, N5JTY (January 1989). 662: 265:The second pair of numbers, called a 16:Geocode system used by radio amateurs 522: 1624:Science and technology in Berkshire 1204: 1114:. From the field hunter's web page. 618: 536:(third ed.). Potters bar, UK: 382: 13: 309:locators might not be compatible. 14: 1645: 1029: 967:Maps with Maidenhead Locator grid 788:International Amateur Radio Union 504:World Geographic Reference System 289:, is found in grid locator  186:World Geographic Reference System 1096:"Grid Locators and Grid Squares" 925:Burlingame, L.A., N7CFO (2010). 176:A Maidenhead locator compresses 47:, which was limited to European 43:, which replaced the deprecated 918: 900: 882: 532:Eckersley, R.J., G4FTJ (1985). 367:precision, and on VHF and UHF, 192:, or any other operating mode. 1411:Military Grid Reference System 1395:International Map of the World 1006:Radio Society of Great Britain 1002:IARU Locator of Western Europe 994:Radio Society of Great Britain 863: 820: 770: 758: 710: 656: 538:Radio Society of Great Britain 534:Amateur Radio Operating Manual 484:Military Grid Reference System 1: 1614:Geographic coordinate systems 1479:Ordnance Survey National Grid 975:ARRL World Grid Locator Atlas 827:Morris, John, GM4ANB (1985). 515: 489:Ordnance Survey National Grid 437:Hardware and software support 1464:(north-east Atlantic region) 1084:"ABC of Grid Locator System" 717:Paige, Bruce, KK5DO (2000). 7: 1559:ITU-T country calling codes 1473:National Topographic System 1468:Irish grid reference system 1462:ICES Statistical Rectangles 1021:American Radio Relay League 979:American Radio Relay League 890:"Ham Locator v 0.1000" 876:American Radio Relay League 678:American Radio Relay League 499:United States National Grid 477: 279:American Radio Relay League 10: 1650: 1564:ITU-T mobile calling codes 270:sub-divided further, into 159:World Geodetic System 1984 116: 1582:Maidenhead Locator System 1572: 1544: 1530:United Kingdom post codes 1492: 1454: 1365: 1354: 1299: 1276: 1212: 719:"Maidenhead grid squares" 472:Global Positioning System 379:precision is often used. 165:Description of the system 57:Maidenhead Locator System 21:Maidenhead Locator System 619:Rosvall, Folke, SM5AGM. 316:Character pairs encode 79:cartographic projection 1519:New Zealand post codes 990:IARU Locator of Europe 829:Amateur Radio Software 287:Newington, Connecticut 262: 212: 173: 41:geographic coordinates 1515:(Republic of Ireland) 1502:Australian post codes 447:Universal Gridlocator 260: 210: 172: 109:VHF Working Group in 1213:Administrative codes 1147:"Maidenhead locator" 680:. pp. 29–30, 43 621:"The Locator System" 587:"The Locator System" 396:VHF/UHF Century Club 285:Memorial Station in 1554:ITU-R country codes 1524:Postal Index Number 1151:dev.unclassified.de 1010:(scale 1:2,000,000) 1004:. Potters Bar, UK: 992:. Potters Bar, UK: 908:"maidenhead – PyPI" 421:The relatively new 113:, England in 1980. 81:. Use of the terms 1586:Historical : 1421:Open Location Code 1256:MARC country codes 540:. pp. 64–66. 510:Open Location Code 377:extended subsquare 327:The first pair (a 263: 213: 174: 1596: 1595: 1488: 1487: 1416:Natural Area Code 1346:FIFA country code 1336:Aircraft prefixes 1309:IANA country code 1291:ICAO airport code 1286:IATA airport code 1220:FIPS country code 1124:levinecentral.com 1120:"Map grid square" 1019:. Newington, CT: 977:. Newington, CT: 878:. pp. 30–31. 874:. Newington, CT: 676:. Newington, CT: 348:The fourth pair ( 334:The second pair ( 307:extended extended 283:Hiram Percy Maxim 1641: 1363: 1362: 1341:IOC country code 1252:(United Kingdom) 1232:FIPS county code 1199: 1192: 1185: 1176: 1175: 1171: 1165: 1157: 1142: 1130: 1115: 1103: 1091: 1078: 1076: 1074: 1059: 1044: 1024: 1012: 997: 985: 960: 959: 949: 941: 939: 937: 922: 916: 915: 904: 898: 897: 886: 880: 879: 867: 861: 860: 850: 842: 824: 818: 817: 807: 799: 797: 795: 785: 774: 768: 762: 756: 755: 745: 737: 735: 733: 714: 708: 707: 697: 689: 687: 685: 671: 668: 660: 654: 653: 643: 635: 633: 631: 616: 605: 604: 602: 600: 591: 583: 570: 569: 559: 551: 529: 413:as the official 383:Adoption and use 341:The third pair ( 320:first, and then 298:extended locator 239:of 180° and the 1649: 1648: 1644: 1643: 1642: 1640: 1639: 1638: 1599: 1598: 1597: 1592: 1568: 1540: 1537:(United States) 1484: 1450: 1397:indexing system 1358: 1350: 1295: 1272: 1238:FIPS state code 1226:FIPS place code 1208: 1206:Geocode systems 1203: 1160: 1145: 1133: 1118: 1106: 1094: 1082: 1072: 1070: 1068:opentopomap.org 1062: 1047: 1035: 1032: 1027: 1015: 1000: 988: 973: 969: 964: 963: 943: 942: 935: 933: 923: 919: 906: 905: 901: 888: 887: 883: 868: 864: 844: 843: 839: 825: 821: 804:cite conference 801: 800: 793: 791: 783: 775: 771: 763: 759: 739: 738: 731: 729: 715: 711: 691: 690: 683: 681: 669: 661: 657: 637: 636: 629: 627: 617: 608: 598: 596: 589: 585: 584: 573: 553: 552: 548: 530: 523: 518: 480: 439: 385: 373:extended square 350:extended square 167: 119: 76:equirectangular 17: 12: 11: 5: 1647: 1637: 1636: 1631: 1626: 1621: 1616: 1611: 1594: 1593: 1591: 1590: 1584: 1578: 1576: 1570: 1569: 1567: 1566: 1561: 1556: 1550: 1548: 1542: 1541: 1539: 1538: 1532: 1527: 1521: 1516: 1510: 1504: 1498: 1496: 1490: 1489: 1486: 1485: 1483: 1482: 1476: 1470: 1465: 1458: 1456: 1452: 1451: 1449: 1448: 1443: 1438: 1433: 1428: 1423: 1418: 1413: 1408: 1406:Marsden square 1403: 1398: 1392: 1387: 1382: 1377: 1371: 1369: 1360: 1352: 1351: 1349: 1348: 1343: 1338: 1333: 1332: 1331: 1326: 1321: 1311: 1305: 1303: 1297: 1296: 1294: 1293: 1288: 1282: 1280: 1274: 1273: 1271: 1270: 1264: 1258: 1253: 1247: 1241: 1235: 1229: 1223: 1216: 1214: 1210: 1209: 1202: 1201: 1194: 1187: 1179: 1173: 1172: 1158: 1143: 1131: 1116: 1104: 1092: 1088:HamRadio India 1080: 1060: 1045: 1031: 1030:External links 1028: 1026: 1025: 1013: 998: 986: 970: 968: 965: 962: 961: 917: 899: 896:. CPAN module. 881: 862: 837: 819: 769: 757: 709: 655: 606: 571: 546: 520: 519: 517: 514: 513: 512: 507: 501: 496: 491: 486: 479: 476: 438: 435: 415:geodetic datum 384: 381: 354: 353: 346: 339: 332: 325: 312:To summarise: 291:​FN31pr 245:false northing 233:prime meridian 201: 200: 166: 163: 118: 115: 33:geocode system 15: 9: 6: 4: 3: 2: 1646: 1635: 1632: 1630: 1629:1980 in radio 1627: 1625: 1622: 1620: 1617: 1615: 1612: 1610: 1609:Amateur radio 1607: 1606: 1604: 1589: 1585: 1583: 1580: 1579: 1577: 1575: 1574:Amateur radio 1571: 1565: 1562: 1560: 1557: 1555: 1552: 1551: 1549: 1547: 1543: 1536: 1533: 1531: 1528: 1525: 1522: 1520: 1517: 1514: 1511: 1508: 1505: 1503: 1500: 1499: 1497: 1495: 1491: 1480: 1477: 1474: 1471: 1469: 1466: 1463: 1460: 1459: 1457: 1453: 1447: 1444: 1442: 1439: 1437: 1434: 1432: 1429: 1427: 1424: 1422: 1419: 1417: 1414: 1412: 1409: 1407: 1404: 1402: 1399: 1396: 1393: 1391: 1388: 1386: 1383: 1381: 1378: 1376: 1373: 1372: 1370: 1368: 1364: 1361: 1357: 1353: 1347: 1344: 1342: 1339: 1337: 1334: 1330: 1327: 1325: 1322: 1320: 1317: 1316: 1315: 1312: 1310: 1307: 1306: 1304: 1302: 1301:Country codes 1298: 1292: 1289: 1287: 1284: 1283: 1281: 1279: 1278:Airport codes 1275: 1268: 1265: 1262: 1259: 1257: 1254: 1251: 1248: 1245: 1242: 1239: 1236: 1233: 1230: 1227: 1224: 1221: 1218: 1217: 1215: 1211: 1207: 1200: 1195: 1193: 1188: 1186: 1181: 1180: 1177: 1169: 1168:earthpoint.us 1164: 1159: 1156: 1152: 1148: 1144: 1140: 1136: 1132: 1129: 1125: 1121: 1117: 1113: 1109: 1105: 1101: 1097: 1093: 1089: 1085: 1081: 1069: 1065: 1061: 1058: 1054: 1050: 1046: 1042: 1041:karhukoti.com 1038: 1034: 1033: 1022: 1018: 1014: 1011: 1007: 1003: 999: 995: 991: 987: 984: 980: 976: 972: 971: 957: 953: 947: 932: 928: 921: 913: 909: 903: 895: 891: 885: 877: 873: 866: 858: 854: 848: 840: 838:0-900612-71-1 834: 830: 823: 815: 811: 805: 789: 782: 781: 773: 766: 761: 753: 749: 743: 728: 724: 720: 713: 705: 701: 695: 694:cite magazine 679: 675: 667: 659: 651: 647: 641: 626: 622: 615: 613: 611: 595: 588: 582: 580: 578: 576: 567: 563: 557: 549: 547:0-900612-69-X 543: 539: 535: 528: 526: 521: 511: 508: 505: 502: 500: 497: 495: 492: 490: 487: 485: 482: 481: 475: 473: 468: 465: 463: 459: 455: 450: 448: 444: 434: 432: 427: 424: 419: 416: 412: 408: 404: 399: 397: 393: 388: 380: 378: 374: 370: 366: 362: 357: 351: 347: 344: 340: 337: 333: 330: 326: 323: 319: 315: 314: 313: 310: 308: 303: 299: 294: 292: 288: 284: 280: 275: 273: 268: 259: 255: 253: 248: 246: 242: 238: 237:false easting 234: 231:, giving the 230: 226: 222: 218: 209: 205: 198: 197: 196: 193: 191: 187: 183: 179: 171: 162: 160: 156: 151: 149: 144: 142: 138: 134: 130: 126: 123: 122:Amateur radio 114: 112: 108: 104: 99: 97: 93: 88: 84: 80: 77: 73: 69: 68:grid locators 65: 60: 58: 54: 50: 46: 42: 38: 37:amateur radio 34: 30: 26: 22: 1581: 1494:Postal codes 1167: 1154: 1150: 1138: 1127: 1123: 1111: 1099: 1087: 1071:. Retrieved 1067: 1056: 1053:sotamaps.org 1052: 1040: 1016: 1009: 1001: 989: 982: 974: 934:. Retrieved 930: 920: 911: 902: 893: 884: 872:QST Magazine 871: 865: 828: 822: 794:19 September 792:. Retrieved 779: 772: 767:Section 5.13 760: 732:10 September 730:. Retrieved 722: 712: 682:. Retrieved 674:QST Magazine 673: 658: 628:. Retrieved 624: 597:. Retrieved 593: 533: 469: 466: 451: 446: 440: 429:In 2019 the 428: 420: 406: 400: 389: 386: 376: 372: 368: 364: 358: 355: 349: 342: 335: 328: 311: 306: 301: 297: 295: 276: 271: 266: 264: 251: 249: 225:antimeridian 214: 202: 194: 175: 153:At the 1999 152: 145: 120: 101:John Morris 100: 95: 91: 86: 82: 72:grid squares 71: 67: 64:QTH locators 63: 61: 56: 53:interference 29:IARU Locator 28: 24: 20: 18: 1588:QRA locator 1446:WMO squares 1359:place codes 1222:(FIPS 10-4) 936:9 September 494:QRA locator 141:QRA locator 87:QRA locator 83:QTH locator 45:QRA locator 25:QTH Locator 1619:Maidenhead 1603:Categories 1441:what3words 1385:Geohash-36 1314:ISO 3166-1 1240:(FIPS 5-2) 1234:(FIPS 6-4) 630:30 January 516:References 302:subsquares 272:subsquares 221:North Pole 217:South Pole 190:Morse code 161:(WGS-84). 148:Maidenhead 111:Maidenhead 96:LOC KN28LH 1546:Telephony 1431:UN/LOCODE 1375:C-squares 1261:SGC codes 1250:GSS codes 1228:(FIPS 55) 1112:jonit.com 1073:18 August 931:n7cfo.com 847:cite book 723:amsat.org 625:jonit.com 556:cite book 407:spherical 369:subsquare 361:shortwave 343:subsquare 318:longitude 229:Greenwich 182:longitude 1634:Geocodes 1535:ZIP Code 1513:Eircodes 1509:(Brazil) 1475:(Canada) 1455:Regional 1356:Geodesic 1263:(Canada) 1139:w8an.net 1008:. 1985. 981:. 2007. 946:cite web 912:pypi.org 894:cpan.org 742:cite web 640:cite web 506:(GEOREF) 478:See also 322:latitude 247:of 90°. 199:BL11BH16 178:latitude 137:contacts 125:contests 94:, as in 49:contacts 35:used by 23:(a.k.a. 1526:(India) 1401:Mapcode 1380:Geohash 1329:numeric 1324:alpha-3 1319:alpha-2 1267:UN M.49 1023:. 2003. 996:. 1984. 684:9 March 599:13 July 241:equator 219:to the 117:History 31:) is a 1390:GEOREF 1367:Global 835:  594:qrz.ru 544:  411:WGS 84 401:Under 365:square 336:square 267:square 784:(PDF) 727:AMSAT 670:(PDF) 590:(PDF) 443:BASIC 329:field 252:field 103:G4ANB 1481:(UK) 1426:QDGC 1269:(UN) 1246:(EU) 1244:NUTS 1100:ARRL 1075:2022 956:link 952:link 938:2012 857:link 853:link 833:ISBN 814:link 810:link 796:2020 752:link 748:link 734:2012 704:link 700:link 686:2018 650:link 646:link 632:2017 601:2014 566:link 562:link 542:ISBN 462:CPAN 458:Perl 454:hack 431:IARU 403:IARU 375:and 180:and 155:IARU 131:and 107:IARU 85:and 27:and 19:The 1507:CEP 1436:UTM 423:FT8 392:VHF 359:On 281:'s 227:of 133:UHF 129:VHF 127:on 92:LOC 70:or 1605:: 1166:. 1153:. 1149:. 1137:. 1126:. 1122:. 1110:. 1098:. 1086:. 1066:. 1055:. 1051:. 1039:. 948:}} 944:{{ 929:. 910:. 892:. 849:}} 845:{{ 806:}} 802:{{ 744:}} 740:{{ 725:. 721:. 696:}} 692:{{ 672:. 642:}} 638:{{ 623:. 609:^ 592:. 574:^ 558:}} 554:{{ 524:^ 464:. 243:a 235:a 98:. 66:, 1198:e 1191:t 1184:v 1170:. 1141:. 1102:. 1090:. 1077:. 1043:. 958:) 940:. 914:. 859:) 841:. 816:) 798:. 754:) 736:. 706:) 688:. 652:) 634:. 603:. 568:) 550:. 324:.

Index

geocode system
amateur radio
geographic coordinates
QRA locator
contacts
interference
equirectangular
cartographic projection
G4ANB
IARU
Maidenhead
Amateur radio
contests
VHF
UHF
contacts
QRA locator
Maidenhead
IARU
World Geodetic System 1984

latitude
longitude
World Geographic Reference System
Morse code

South Pole
North Pole
antimeridian
Greenwich

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