Does anyone know how to reset/clear the 'service' message that comes up when Seaward decide the unit is due cal? The only solution we have is to send it to Seaward for 'unlocking'.
Our client has over 60 of the units, we can calibrate them in the field but not reset the service message.

I have no idea on how (or even whether) users can reset the alert message, but why not ask the company directly? Plenty of contact info at their website http://www.seaward.co.uk/

Moderator note: I modified your thread title to clarify what a "pat" was and to aid in future search engine searches.