The Cromarty Firth is easily accessible under all weather conditions with deep sheltered waters. The seaward approaches to the firth offer an uncluttered passage to large vessels and the entrance is well marked by two prominent headlands known as the North and South Sutors. The entrance channel is approximately half-a-mile wide with water depths ranging from 15.24 metres to 26.57 metres at Chart Datum. Within the Firth, water depths up to 55 metres exist.