X-TRACK, is a regional altimeter products for coastal applications. Along-track tidal constants (amplitude, phase lags and associated estimation errors for 73 constituents) derived from the X-TRACK T/P and Jason 1&2 is available every 6-7 km along the satellite ground tracks.

X-TRACK areas :

| short name | long name |

|:------------|:---------------------------------|

| adelie | Adelie-Mertz |

| amazon | Amazon |

| asa | Atlantic South America |

| chinasea | China Sea |

| drake | Drake passage |

| eaustralia | East Australia |

| gom | Gulf of Mexico - Caribbean Sea |

| gulfstream | Gulf Stream |

| hudson | Hudson Bay |

| humboldt | Humboldt current |

| kerguelen | Kerguelen Islands |

| labrador | Labrador Sea |

| medsea | Mediterranean Sea |

| nea | North East Atlantic |

| nindian | North Indian Ocean |

| norway | Norway |

| nwa | North West America |

| nwp | North West Pacific |

| sea | South and East Africa |

| wafrica | West Africa |

| waustralia | West Australia |

| wla | West Latin America - California |

| wtp | West Tropical Pacific |