Frequently Asked Questions

Why do some ships appear to stop in the sea?

Ideally AIS receivers would be regularly spaced around the coast, but since I can't choose the locations some areas are well covered and others are sparse. In areas where there is sparse coverage, you may see a ship appear to pause as the ship moves out of range of the volunteer AIS receiver. No updates are being received and this is indicated by the colour of the ship fading to a pale colour. Eventually the ship may move into the receiving area of another volunteer AIS receiver and it will appear to jump across the map before starting to move smoothly again.