EASA requirements:-
Navigation problems at lower levels and in reduced visibility:
(A) actions before descending;
(B) hazards (for example obstacles and terrain);
(C) difficulties of map reading;
(D) effects of wind and turbulence;
(E) vertical situational awareness (avoidance of controlled flight into terrain);
(F) avoidance of noise sensitive areas;
(G) joining the circuit;
(H) bad weather circuit and landing.
Aviate - Navigate - Communicate - and then manage the problem
Low Flying - Introduction

Low Flying - Consolidation

Weather Avoidance & Diversion

VFR diversion
VFR diversion

Lost in the sky? How to find your position without GPS
VOR triangulation
Terrain and Weather Awareness

Minimum altitudes; MOCA; MEA