Most major US and UK car rental (hire) companies are available at or near the Glasgow International Airport. Once you have your rental car is is less than 10 miles to the first Colquhoun site in Tour Part 1. You head west on M8 and then it turns north-west about 5 miles until you come to the A898. Travel north on A898 crossing the Erskine Bridge down into Old Kilpatrick. Most major rental companies will offer GPS devices for the UK. Other options are to bring one from home pre-loaded with the coordinates of the sites (see Maps of Sites section) or if you have smartphone with data services you can use your phone to navigate.