Unlike most cranes, the operator must move around the vehicle to be able to view his load; hence modern cranes may be fitted with a portable cabled or radio-linked servo control system to supplement the crane-mounted hydraulic control levers. In the UK and Canada, this type of crane is almost invariably known colloquially as a "HIAB", partly because the manufacturer HIAB invented the loader crane and was first into the UK market, and partly because the distinctive name was displayed prominently on the boom arm.