Good advice dozy but i am 1 step ahead as I carry 6 in case the first 5 go down. I always think you just can’t be too careful. I know lads that carry a dozen but I think that is a bit extreme.
I think we should just follow the advice from Dozy. He seems to have his head screwed on.
Too sum this thread up. Sat navs are a tool as are maps the most important thing to have is a functioning brain. Unless you are Dozy in which case invest in more sat navs as a fail-safe. 
blue estate:
tachograph:
If a driver is daft enough to blindly follow a sat-nav why would he/she have enough common sense to be able to find a route with a paper mapTo true
Thursday I had to go to Workington , came of M6 at Carlisle and saw signs for Workington and followed them as the new road was not on sat nav , if I followed sat nav I would have gone through city centre
Yep and the new M8 isn’t even on my updated Sat nav and its been open for 9 months! Try getting to Bellshill from the north via the M73 and you are well screwed without local knowledge.
UKtramp:
peirre:
The problem with the tesco routing policy and the directions that are on the back of each delivery note are that it’s highly likely that they haven’t been updated since they where 1st risk assessed and drawn up & put on file, so I suspect they won’t be up to date with local authorities planning changes or take into account any new roads or building that has been done since thenUKT should take everything he’s told by the green machine with a pinch of salt, or they’ll green(brain)wash him to think everything inc the sky is green
They are done by Tesco, if they are not updated or correct the rule is not to deliver to that store. The reason why they have banned sat nav is because, a lot of their stores have had planing permission granted providing that they receive deliveries via certain routes into the stores which has taken into account low bridges, congestion and the least disruptive for the residents.
Well I don’t know any truckers sat nav that does not allow for low bridges (provided of course the driver inputs the correct travelling height before setting off).
IndigoJo:
I did a couple of days’ agency driving last December for their RDC in Reading and they give you a “risk-assessed” route and you had to use it, so the assumption, I guess, is that you don’t need a sat-nav other than to “disobey orders”. The problem of course comes when the route prescribed is blocked or has roadworks and the longer alternative route would be quicker. At Reading, it’s all contracted to Maritime, and I was working through a subcontractor so that didn’t apply to me, and I’m guessing the same is true of other depots (even if the contractor is different).The bizarre thing is that their trailers don’t have proper height indicators; they have a “box height” indicator, a bit like a shipping container, but you know to add 5ft to the height of a shipping container and I didn’t know how to work out the overall height of these trucks. (We had 6x2 Actros units, which weren’t even compatible with some of Tesco’s trailers.)
Never thought of carrying a tape measure with you in your kit bag? Then measure ground to base point of the highest part of the trailer (assuming it to be higher than the air deflector on the cab roof). If the trailer is loaded add 3 inches and err … make sure your ride heights are set properly!
AndrewG:
Radar19:
Some of you lot are really living in the Stone Age, you go home and beat yourself round the head with a club for entertainment or something? Its 2017 people! Get with the times, why bother hauling a massive box of A-Z’s around when you can have it all in one device that fits on the windscreen.My tools of the trade are my Tom Tom 6000 and Google Maps. Not once have they led me wrong because I actually do my research before I start my run. I’ll get on Street View and walk around till I find the place I’m looking for, then I’ll cross reference it with the route in my Sat-Nav is giving me. If I don’t like it then I’ll, hey, get this, I’ll decide the way myself!
Don’t start with this crap of “You’re not a real driver if you use a Sat-Nav” etc. I’ll use whatever I need to to my job easier. Work smart, not hard!
What happens though if your nav had a breakdown, you could be in the middle of nowhere not actually knowing whereabouts you are let alone the del address. Having a glance at a map gives you an idea which direction/ region youre heading and will also show terrain, not really something you can do with a nav to good effect. Navs have their place as an aid but an aid only, nothing will ever give you the info a paper map gives…
Bloody hell! If you’re blindly driving along with no clue as to where you are then I suggest you shouldn’t be driving. (Having said that my missus needs a sat nav to find the loo at home but many females have mis-wired brains 
)
I appreciate that at night on a motorway one may not know exactly where you are but I should hope that someone trunking from Manchester to Glasgow has some bloody idea where he is at least which side of the border he is at any given time!