In reply to Robin Woodward:
I used the DSP extensively for about five years until it became poorly after being dropped on the garage floor then replaced it with the DSP Pro. This may have a better range than the original - I can't compare them - but I have formed the view that the DSP Pro's marking function works better. I assume the DSP Sport will have the same marking performance as the Pro but haven't used one enough to know. With the original DSP it would mark a transceiver you'd found but it sometimes lost that mark when you moved off to another part of the site so could lead you back to one you'd already found. This isn't the end of the world if you know it's a possibility and organise your search strategy with it in mind and I've used it happily in plenty of multiple burial exercises.
For a single burial they work really well, as do most other three antenna digital beacons, the Scan function can be really helpful in a multiple burial scenario, the frequency checking function I never used and suspect it may be redundant in the digital age.
So from the point of view of function, in my opinion, the original DSP still works fine. It might be worth thinking about how much longer they'll keep doing software upgrades, etc. Hope that's some use.
