NightPilot

If it doesn't correct the clock time, how can it even work? GPS requires microsecond accuracy. 17 seconds is around the world. WWV isn't that accurate in any case, only to a second or so, depending on the state of the stratosphere and the number of skips involved.

You can use any GPS for which you can get a cable, or any bluetooth GPS if you have built-in bluetooth, or a bluetooth dongle. If you can send waypoints to your GPS from your laptop, then you can use it with S&T.

PDAs have no USB port, and are not USB hosts. To connect a GPS to a PDA, you must use serial protocol, and have a specific cable with the GPS connector on one end and the PDA connector on the other. Adapters only work on PCs.

Must have been a localized problem. I was flying, using GPS, on the 10th and saw no anomalies. It's actually not possible, AFAIK, to jam GPS signals over a large area. Over a small area, it's certainly possible.

I use NiMH batteries, and have a fast charger in the truck. When batteries go dead, it doesn't take long to change them and recharge the dead ones.

From what I can tell, the iphone's usefulness is limited for anything. Lots of hype, not much substance.

The pfranc adapter has a limitation, in that it can only be used in a car. Semsons is a reputable company that has been around for a long time. I think one of those adapters would work for you.

DeLorme Street Atlas will let you edit the maps, and add roads as necessary. I'm not sure about just entering the new address for routing, but I don't think any program will let you do that. Of course, that runs on a PDA, not a handheld GPS. I don't believe it's possible, at least in practicality, to edit the maps on a handheld GPS. You can buy new maps as they become available, but it's not cheap.

CacheNav works fine for me. The pointer won't point in the right direction unless you're moving at a decent pace, though. Don't use the arrow, use the bearing to the cache, and a compass. The bearing will show correctly unless you're very, very close, and when that starts moving around, you need to be looking for the cache, not at the GPS. You can get the plugins you need from the Smittyware site.

You have to tell GSAK and the site your home coordinates. You have to tell GSAK what the abbreviations for the US states are. There is a setting to take the default US abbreviations. Reading the help pages, in the program and on the GSAK site, would be a good place to start.

Any Palm model will work. Some have desirable features, however. I suggest something with an SD card slot, which allows you to transfer the cache information without hotsyncing, and gives more storage options. You also probably want a somewhat newer model that uses USB instead of serial connection for hotsyncing.

If it will run on the M105, it will run on the Z22.

You won't get the maps. They're not on the geocaching site. There is no way I know of to get the maps through Sunrise or Plucker. They wouldn't do you much good anyway, since they're so small, and it's not possible to make them zoomable.

Huh?? The Palm gets the position information directly from the GPS, so it's exactly as accurate as the GPS it's getting the position from. I connect a GPS to my Palm all the time, and it's as accurate as you can get.

Those old models won't do wifi, though, and are a PITA to use to connect to a phone. A TX costs more, of course, but it does lots more. For what the OP wants to do, an old Palm or PPC just won't do the job, and a newer model with bluetooth and wifi would probably be worth the extra money.

Most Palm nav programs do let you choose north up or track up. I prefer north up, because it's easy to see at a glance which way I'm going, and I'm used to that after using a map for so many years. That's just me, though.

How many times are you going to post this same question?

If you're using a PDA, there is no need to look at the GPS screen. There are lots of mounts available to put a PDA on the dash, but I find Velcro works very well for almost everything.

For that price, you won't get much. Maybe something second-hand.

The M515 was manufactured long before bluetooth was invented, so you'll need a cable to the GPS. It can certainly be done. Cachemate has the CacheNav plugin which will find caches for you, as will Cetus, but mapping software isn't going to run well on a Palm that old. Cachemate will do well on an M515. For record keeping, it depends on what records you want to keep.

PC-Mobile sells a bluetooth adapter that you can connect to your Garmin to make it bluetooth-enabled. I have one, and it works well. You'll need a special cable, and you can either buy one from PC-Mobile or make it on your own - it's a 2.5mm (cellphone) plug to Garmin. It doesn't need to be very long, it just connects the adapter to the GPS. The Garmin must be set to NMEA interface for this, NOT Garmin. I don't think you'll be very happy with the Garmin Mobile 10 software. I've seen nothing but problems with it on several forums. It's still beta, but probably should really be alpha. It crashes regularly, it seems. I haven't seen anyone happy with it.

The Palm OS is the most bulletproof, and the TX has built-in wifi, and can connect to a bluetooth GPS. You can connect to the 76 also, with the proper cable. A PPC will also work for you, and you may be more familiar with Windows anyway. Either the Palm TX or a PPC can also connect via your cell phone in a pinch, using bluetooth.

PC-Mobile

DeLorme Street Atlas will do that. It has versions for PC, PPC, and Palm, so any PDA will run it. Get a bluetooth GPS, put it on the truck someplace, and you're set. SA allows you to draw in new streets, etc, but you need to do it on the PC, and transfer the new maps to the handheld. The maps are very good, the software only so-so.

I'm not sure I would rely on coordinates posted by someone I didn't know, or know the qualifications of, to keep me safe while sailing. It's easy enough to get actual coordinates for landmarks, buoys, and other navaids, and that's what I would use. But whatever works for you...