I have been using Avmap EKP IV for a while and apart from rather clunky PC interface
using C-MAP's "PC Planner"
C-Map, who either own or are somehow connected with Avmap, are a useless outfit which rarely replies to any questions. This is Avmap's weak link. In the USA, somebody set up the whole distribution/support network so the Italians don't have to deal with customers
Have you tried loading routes into the Avmap from either Navbox Pro, or from Jepp's Flitestar?
My preference would be something like an IBM (Lenovo) X60 or X61 convertible notebook/tablet with Jeppesen Flitedeck and a GPS receiver-only unit attached. It can be used as a kneeboard or on a gooseneck stand.
I would agree, for very easy VFR. I use a Motion LS800 tablet for this, running various VFR charts which can be "found" in various places
That way you get the real printed charts running as a GPS moving map. The ultimate for VFR. But this can be pricey and is not for everybody as it isn't exactly compact.
The Bendix-King KLN89b and KLN94 are superb for this, and quite reasonably priced...especially used 89b's
Having used a King KLN 89b for over ten years in my private aeroplane, it has supplied very reliable and accurate service.
I have been flying behind a KLN94 for 6 years and agree; a super simple to use unit which does exactly what one needs for airways stuff. However its moving map screen is really tiny and virtually useless. I have a KMD550 MFD for that. Also the KLN94 never supported RNAV SIDs/STARs or PRNAV and never will - I have this in writing from Honeywell. This means that while it is fine for an IFR panel mount (real IFR flight is much simpler than all the regs coming out of Eurocontrol...) I wouldn't spend a huge amount of money putting one of these into the panel. IMHO, for a panel mount GPS, the KMD150 is the best - basically a panel mount version of the Skymap III.