+'s and -'s
iphone w/ motion x: compact, not redundant, it's a phone! it has apps! it works But, a) you hard to see it, b) you need to have a cell signal (which is VERY iffy here in New England)! I use to look at the map of the "big picture" of where I am going...
Garmin Etrex handheld: compact, "waterproof", great for "off-road", but a) hard to see, b) lousy user interface, c) a pain to download to, d) takes batteries. I use for my off road adventures.
Garmin Nuvi GPS: big screen easy to read, don't need cell signal, but a) not waterproof, b) not too good for "off road", c) big and not as portable.
"if only I had known, I should have become a watchmaker. (1945)”. ― Albert Einstein.