Sulphur Beach Boat Ramp sits on the shoreline at Northcote Point on Auckland's North Shore, and it holds a solid 4.5 rating on Google.
Ramps on tidal harbours live by the tide tables: on silty upper-harbour flats, launching is easiest in the hours around high water, and the same slipway can end in mudflats at low tide. Checking tides and wind before you hook up the trailer saves a wasted trip. On the ramp itself, unwritten etiquette matters — rig up away from the slip, launch one boat at a time, and move the car and trailer off promptly so the next crew can get in. Early mornings around a fine weekend tide are busiest, which is why regulars arrive at first light.
For North Shore boaties, this well-rated ramp at Northcote Point is a handy local way onto the upper Waitematā without the drive across the bridge.