I have an NKE DL18, Depth and Speed Tranducers, Loch-Sounder box, Topline connector box and Fluxgate compass sensor. All used but in good condition and in working order.
Earlier this year these were serviced by Tinley Electronics (the UK NKE Importer) at a cost of £200. When I refitted them the speed and depth were not reliable, I sent them back to Tinley who insist that they are in perfect working order. The DL18 and the compass definately work perfectly. The speed and depth seem to work OK out of the boat but I decided to replace them. If the buyer cannot get them to work I will take them back and refund the cost.
I've no real idea of what they're worth but a comparison with new prices suggests £250 for the lot would be fair, but make me an offer. Free postage in the UK, I'm happy to send them anywhere but may have to charge some of the postage cost.