Inmarsat rhymes with:
landsat, sat, tvsat, arnatt, at, at-bat, balyeat, bat, batt, batte, begat, bhatt, biernat, blatt, brat, bratt, cat, catt, chat, dat, delatte, deslatte, elat, fat, flat, flatt, gat, gatt, glatt, gnat, gujarat, hat, hatt, hnat, jagt, kat, katt, klatt, krat, kratt, labatt, landsat, mat, matt, matte, mcnatt, nat, nonfat, pat, patt, platt, platte, pratt, pratte, prevatt, prevatte, rat, rat-a-tat, ratte, sarratt, sat, scat, schadt, shatt, slaght, slat, spat, splat, spratt, stat, tat, that, tit-for-tat, tvsat, vat