Garmin and Base camp

You have a couple of options. If your 64 works like my Etrex20 and Montana you can set tracks to always show. The other option would be to turn them into a transparent overlay http://www.javawa.nl/imgfromgpx_en.html

If I understand correctly, you want to combine several individual tracks into one track, or file. That can be done in BaseCamp.

You'll see the individual files listed in BC. You highlight the files in the list, then select "Join..." from the menu or by right clicking (on a Mac). You will have the option to select how the individual files are ordered.

The problem with that approach though is that you'll end up with quite a mess of tracks as ends of one are joined to start of others ...

Not sure what you are saying. Please explain. I've done this before, works great.

If I understand the OP correctly he has numerous tracks that criss cross the area he's interested in that he's travelled at different times. Simply joining these tracks together will result in lots of straight lines joining the end of one to the start of the next.

I too have joined tracks together many times but it won't solve his particular issue.

I upload tracks from my GPSr frequently. They are easily edited in Basecamp using "Track Divide", "Track Join" and delete key. Individual track points can also be moved for better alignment if necessary.

I usually save the edited file in .KMZ format for viewing with Google Earth

Joining tracks will solve the issue, but *might* have some straight line connectors if all unique tracks are joined into one file. That might work for the OP, and depends on the segments. If the segment terminations overlap on other segments, all will be good, no straight line connectors. Sounds like that could very well be possible. Joining segments can be massaged to make things work.

While I understand what most of you are saying, as I use joining/splitting tracks etc pretty much daily, let's wait and see how the OP responds. Not only does it appear that he hasn't, to use his words, 'dived into BaseCamp yet' so will have a bit of a learning curve but trying in BaseCamp to join widely separated tracks that may or may not criss cross each other so they don't end up a tangled mess and are easily viewable on his GPS may simply not be feasible. Yes, in some limited circumstances it might be, but overall the simplest route for him is just to set his tracks to 'always show' on his GPS. Failing that the program I linked to allows him to create an overlay of his tracks quite easily.

I'm not seeing the issue of "widely separated tracks" as you said in your post, in the OP post. And from reading the OP post, it appears that there could very well be common main tracks or roads that could be a mainline or backbone for other tracks and evade the dreaded straight lines. He's talking about hunting and fishing, not major trekking.

With careful massaging, this could easily work. Now for a newby at this, it could take a while.

Given the fact the OP posted over 2 days ago we might never know

I will look at that overlay option when I’m home

I will look at this option as well and pick the best option. I appreciate all the help