several different makes of inexpensive electronic hand held computers
Please define 'inexpensive'
Mechanical
CRP-1 £48.95
Electronic
CX-3 £89.99
There's the base model CX-2 but it's £58.39, £10 more than a mechanical device.
Couldn't find anything other than the ASA products in a quick search of popular UK equipment providers.
As an instructor, the CRP-1 translates nicely from talking about triangle of velocity theory to a practical way of resolving it. Admittedly the circular sliderule side takes a bit of getting your head round but as DD says, you do need a 'ballpark' answer before you start the calculation anyway, whatever tool you use. Once in practice, the sliderule is quicker than a calculator, same as an abacus is quicker for an adept user.
TOO