GPS:

Due to illness I can no longer spatially orient - translation, I get lost going to the corner store. Hence a good GPS has become a necessity when going anywhere on the trike, especially far back in the mountains where I usually ride, far away from human habitation. So I use a Garmin GPSMAP 60CSX  wherever I ride. This model is highly sensitive and so works well under the tall trees and in narrow mountain valleys where I ride. For me, it is much better than the Garmin 305, 605, or similar GPS systems made specifically for trikes. Why? Because it has more features, is more sensitive, has a longer battery life, is highly visible in bright sunlight, is more waterproof, works better in ice and snow, and I do not need (or want) the so-called racing features of these bike-only GPS systems. But it costs the same as a "bicycle GPS". Just my opinion

At any rate, I wanted the GPS in a position tilted toward me so that it would be easy to see with a glance down, without moving my head. And where I could easily reach the bottons to change screens or functions. And finally, where the antenna could have an unhindered view of the microwaves beaming down from the GPS satellite system. Originally I mounted it on the cruxiform, but this did not meet these three criteria very well. As it turned out, the water bottle holder on my ICE QNT trike was the best place.

Here's how to mount the thing:

1. Purchase a suitable holder. For my Garmin 60Csx I purchased a standard Garmin car holder for $15.
2. Next, drill four holes in the holder as shown in the pic below.
3. Get some strong zip-ties ($.20 each) and thread them through the holes (see pic).
4. Cut an old water bottle cage at the point shown in the picture below. Use a water bottle cage which has two pieces of metal holding the base of the cage together for strength. If you cannot find one, just put a small piece of wood between the two sides of the cage held to the cage with a little epoxy.
5. Screw the now cut water bottle cage onto the cage holders on the trike.
6. Put some thick rubber strips onto the water bottle cage (the GPS will sit on these). Just cut an inexpensive ($1.00) rubber shoe insert or use something similar. The idea is to provide a bit of padding for the GPS so that it is not sitting on bare metal. Thick rubber works best, as it is semi-rigid. Then zip-tie your gps holder onto the water bottle cage as shown in the picture below.
7. Thread a lanyard (Garmin supplied a nice one for a couple of dollars) into the GPS. You can just see it in the fourth pic below on the as the black thing directly to the left of the GPS.
8. Pop the GPS into the holder.
9. Use a piece of two sided velcro to strap the lanyard securely to the trike. I do this as an extra precaution in the unlikely event that a sudden pothole will knock the GPS from the holder. It has never happened to me, but I would hate to loose this expensive device. The velcro and lanyard ensure this will never happen.

The only problem I have found is that in winter when wearing heavy gloves, it is a bit difficult to push the buttons on the GPS. A Garmin 305 or 650 has bigger buttons, but IMHO is very inferior to the the features of the 60Csx. The 60Csx also has a much longer lasting battery. I use topographical maps exclusively as these give me elevations of mountains - something really important to know in my riding area, though YMMV. Incidently I still use a cycle computer, which I attach to the left fender support. I have found that when deep in a valley with mountains, forest, and rainfilled clouds all around the GPS sometimes cuts out for a minute or so - the cyclecomputer is nice therefore to keep the odometer accurate. I use a $30 Fitzer 4-line display cyclecomputer which in last 50,000+ Km on my trike has never failed regardless of rain or temperature.

Update: Someone wrote to ask how I use the water bottle now that the gps is mounted where it usually goes. That's easy. I mounted two water bottle holders underneith the seat by useing zip-ties and some electrical tape to secure them. This mounting does not interfere with the seat quick release when folding the trike, nor with the swing of the steering arms. Nor does it interfere with the panniers which line the sides of the seat. It is easy to just reach down and grab a water bottle from this possition, which also has the advantage of keeping the weight low and right on the center of gravity, as well as keeping the metal of the stainless steel water bottles well away from the GPS antenna.

How I mounted a gps on my ICE QNT trike