Fowhere can I find a manual for the old fishing buddy 2 fish finder

SOURCE: no manual

Here is a link for your fish finder: http://www.eaglenav.com/upload/Eagle/Documents/Manuals/fisheasy2_0143-641_091902.pdf

SOURCE: i need a manual for humminbird wide 100 fish finder

You can find the manual you need at: http://www.humminbird.com/support/FAQ.aspx?faqid=72

It is listed in the legacy products area with the wide series of units.

SOURCE: need a op. manual for uniden mc-600 fish finder

There is not a Uniden Marine Electronic with MC-600. Here's are all the manuals for Uniden Marine Electronics =>

http://www.uniden.com/index/manuals_results.cfm?cat=7

If it's the Cobra Fish Finder MC600, here's the operation manual =>

http://www.cobra.com/downloads/manuals/MC600C_MANL_ENG1.pdf

SOURCE: Just found a fishing buddy

It has an online manual to download.
do a search for humminbird 140c.
some portables only work at very slow speed or sitting still in water.

SOURCE: i bought a fish finder from harbor freight and it

http://www.harborfreight.com/manuals/94000-94999/94511.pdf

Your welcome!