M3
Neptun covers M3 (Ireland) through the Marine Institute network. One GET request returns its readings as JSON — in the same shape as every other network Neptun serves, so you write the parsing once.
Source: Marine Institute · Position: 51.2160, -10.5483
Request
curl -H "Authorization: Bearer mapi_YOUR_KEY" \
"https://neptun.marine-api.com/v1/levels?lat=51.2160&lon=-10.5483&radius=5"