I rang them on 08458730101 from above Garrigill after failing to get a lock for some considerable time. Evidently the problem was that there had been a software update to improve the lock which was not on my system. They sent me an SD card to correct it after enabling me to get a lock over the phone.
Yesterday however, I got an email from them informing me of a further update (V1.4) which is available from their website. This has a number of minor additions to its functions which are, in fact, very useful. there is also one which can be purchased which claims, it says, to give 100hours of battery life!!!
If you have registered your satmap with them these updates come regularly via email.