Tidal Forecasts
The Admiralty provide free seven-day forecasts for ports around the UK. The seven-day forecast for Port Askaig can be found here: Port Askaig
Ship Information
The position of larger vessels can be identified by tracking Automatic Identification System (AIS) transmissions. These are publicly broadcast on VHF radio and the data is collated by a number of useful websites such as www.shipais.com
Marine Forecasts
Wind and wave forecasts are available from a number of sources such as the SeaStates website from APBMer. APBMer have also produced a number of reports to quantify the wave and tidal resources around the UK.