I think I've got a Garmin GPS 45 packed away. It may need a new antenna but it does work and I've got a battery power lead. It has even got Hastings / Pevensey / Langley Point / Sovereign light platform, etc., in it as waypoints - just for you...!
I'll double check on Tuesday. If you still needed it, it'd be a 'donation to McMillan' job.
"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin