HN5 and 78s are completly different beasts - interesting recommedation. I have HN5 but wouldn't bother taking it for a walk. If you really need dual use unit with raster image viewing capabilities TwoNav Aventura is my recommendation. Battery life is 20 hours plus...but depends on your other needs as well - budget (TwoNav is twice the price of 78s..like the HN5), available maps, true water proofness (TwoNav is only "rainproof" and doesnt float) etc etc.
To find yourself, think for yourself © Socrates 469 BC