def METHOD_NAME(msg0, msg1, t0, t1):
    cprlat0 = get_cprlat(msg0)
    cprlat1 = get_cprlat(msg1)
    cprlon0 = get_cprlon(msg0)
    cprlon1 = get_cprlon(msg1)
    return cpr2position(cprlat0, cprlat1, cprlon0, cprlon1, t0, t1)