Planning a 100 miler

Me and a neighbour are thinking of having our first 100 mile run in the Summer.
And even though i have done the route a thousand times in the car i haven't done it by cycle.I have Strava on my phone but this would drain the battery before i get half way i would imagine,so what would you recommend that i use.?
I could of course just use the old fashioned map and follow my nose if nothing else would do,and i do not want to shell out for a Garmin,at least not yet as finances have to be respected.I thought i could simply print out the route from Google maps but would like to be able to ride without looking at a map every five minutes.But if this is the only way then so be it.
And even though i have done the route a thousand times in the car i haven't done it by cycle.I have Strava on my phone but this would drain the battery before i get half way i would imagine,so what would you recommend that i use.?
I could of course just use the old fashioned map and follow my nose if nothing else would do,and i do not want to shell out for a Garmin,at least not yet as finances have to be respected.I thought i could simply print out the route from Google maps but would like to be able to ride without looking at a map every five minutes.But if this is the only way then so be it.
Cannondale CAAD 8 105
Rockrider 8.1
Rockrider 8.1
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That's what I do and haven't got lost yet (...well not so lost that I couldn't get back on track with just a map).
http://www.amazon.co.uk/EasyAcc-Portabl ... ttery+pack
Then use Strava or Endomondo
just use a map folded/cut to make it easy to use if you want to go that far, or even just write a sheet of directions and put in your pocket. A few road numbers, towns and guidance notes shouldnt need more than a couple of pages from a notebook?
Or photocopy sections of your big AA road atlas from the car and seal in clear plastic as before.