Not all preset locations in PredictWind are 1km resolution. To make sure your area has 1km resolution check out the world coverage maps.
Once you can confirm your area has 1km resolution coverage you can begin the location setup process.
When selecting the red dot for your forecast location, be sure to select one of the dots plotted closely together along the coastline.
These are 1km resolution locations, while the points further offshore are 8km resolution locations.
If you set up a custom location point, it will automatically be at the highest resolution supported for that location.