Worth noting that the UK has a difference on this. The ICAO rule requires sight of the surface at or below 3000 ft. See Annex 2 Table 3-1.
UK difference (GEN 1.7)
4. Class F and G Airspace: The VMC minima at and below FL 100 applies down to the surface (instead of down to 3000 ft amsl) with the minima at and below 3000 ft as an alternative. The proviso ‘or 300 m above terrain whichever is higher’ does not apply in the UK.