North America is the only contiguous continent that spans from low to high magnetic latitudes, and its mid-longitude region covers the widest latitudinal range. There are CANOPUS and IGPP-LANL magnetometers located along this longitude, but the gap between them need to be filled by new stations in order to make the full use of the normal-mode method, which requires short separation (roughly 100-300 km) between two adjacent stations.
The McMaC project will build 9 new magnetometer stations in the United States and Mexico roughly along 330° magnetic longitude. These new systems and the existing CANOPUS and IGPP-LANL stations at the same longitude will cover L-values from 1.3 to 11.7, forming an unprecedentedly long north-south magnetometer chain.
McMaC consists of 6 CARISMA stations, 2 IGPP-LANL stations, and 9 new stations. Their locations are shown in the map below:
| Station | Geographic Latitude | Geographic Longitude | L |
| Rankin Inlet | 62.82° | 267.89° | 11.67 |
| Eskimo Point | 61.11° | 265.95° | 9.70 |
| Fort Churchill | 58.76° | 265.92° | 7.83 |
| Gillam | 56.38° | 265.36° | 6.42 |
| Island Lake | 53.86° | 265.34° | 5.33 |
| Pinawa | 50.20° | 266.75° | 4.15 |
| Glyndon | 46.87° | 263.55° | 3.42 |
| Cambridge | 45.56° | 266.75° | 3.18 |
| Worthington | 43.6° | 264.4° | 2.86 |
| Bennington | 41.36° | 263.84° | 2.58 |
| Americus | 38.5° | 263.7° | 2.28 |
| Purcell | 35.0° | 262.6° | 1.99 |
| Richardson | 32.98° | 263.25° | 1.87 |
| San Antonio | 29.44° | 261.39° | 1.66 |
| Lyford | 26.4° | 262.2° | 1.53 |
| Linares | 24.8° | 260.4° | 1.46 |
| Juriquilla | 20.70° | 256.90° | 1.33 |
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