Just placed an order with www.hobbytronics.co.uk for the LSM303DLM Tilt Compensated Compass, this will allow us to get a bearing (obviously!) but also detect when the boat has capsized. The plan is let the main sail out a bit more to help aid in getting the boat back up and running.
This should be delivered in the next few days, but I’ll be on holiday for a week beginning Saturday (14th July, for a week) in the search for some sun so won’t be able to get started till i’m back. There won’t be any updates either whilst i’m away.
Here’s a PDF explaining the use of the LSM303DLM