Portscatho maps beach info maps weather & tides photos Standard Map Satellite Map OS Style Map Select a map type from the following styles. All are at the same location and to the same scale How to get to Portscatho From Truro or St Austell. take the A390 before turning onto the A3078 St Mawes rd. Turn left in Trewithian. signposted Portscatho.