IELTS Task 1: The map below is of the town of Garlsdon.

The map below is of the town of Garlsdon. A new supermarket (S) is planned for the town. The map shows two possible sites for the supermarket.

Summaries the information by selecting and reporting the main features, and make comparisons where relevant.

The map shows the town of Garlsdon. Program of this town is building a new supermarket (S). The supermarkets have two potentially located.

In general, located for build new supermarkets are crossed over by railway and main roads. It has a few cities which is of 65,000 population appears in the map.

The located of S1 is in the countryside. It is more restful because it has long distance from industrial areas. Because of this area placed in suburbs between railway and highway to Hindon (12 km with 10,000 population), there is easier to people visited by transportation.

Moreover, the recommended location of S2 for supermarket is in the town center. In the map, there are two housing area in north side and south side. The highway is also to connect from Cransdon (25 km with 29,000 population) to Bransdon (16 km with 15,000 population). Although this area is industrial area, there is no traffic-zone in here.

Overall, both of two areas are able to build supermarket and people could use transportation to this area.

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I think this will be better if you separate between Overview and body

Some ideas:
Key trends for Supermarket 2 (S2)
As it can be seen from the map, Supermarket 2 is surrounded by rust belt cities. Also, in the north and south of its map, there are small resident areas. The busy main road from Cransdon to Bransdon and vice versa is linked to the center of town, where Supermarket 2 is sited in.

Key trends for Supermarket 1 (S1)
due to Supermarket 1 located in countryside between the main road and the railway to Hindon, there is a high probability that Supermarket 1 would show a great merit. People from the town centre and the other outskirts could use train and car to this area, while the use of transportation in the area of Supermarket 2 is not allowed.

I am googling now. This is information about maps in IELTS.
Generally there are two types of maps in the IELTS test. First, they may give us two maps of the same place but in different times (e.g 1940, 2010). They ask us to write a report on how this place had changed over time. Let's call such maps diachronic. Second, they give us one single map and ask us to describe two locations on them or even compare them. Let's call them synchronic maps.

Diachronic maps
Intro: here you should state what the maps show
Overview: state what the direction of change is (is the city more modernized, has it turned to a tourist attraction/resort, etc)
Body: start with the most obvious changes and then try to cover all the changes.

Synchronic maps.
Intro: here you should state what the maps show
Overview: depending on what the purpose of those points are, give an opinion about which one may serve our purpose better.
Body: compare the two points