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Getting u-blox MAX-7C GPS to work with Assisted A-GPS

So you got your u-blox GPS and wired it up only to look at it struggling to get a valid fix? Under less than ideal conditions, it can take a better part of half an hour. That's because unlike your smartphone GPS, it doesn't have the luxury of having downloaded all the auxiliary navigation data (almanacs and the lot) out-of-band, via fast mobile connection. Instead it relies on the satellite's signal itself, which is being transmitted to you at meager 50 bits per second (I'm not missing "kilo" there, it's three orders of magnitude slower than your 2G GPRS connection).

Luckily, the u-blox receivers are fitted with what the company calls "AssistNow" capability and it does exactly the same thing your iPhone does - feeds the GPS with pre-downloaded almanacs, speeding up the acquisition process to mere seconds.

In principle, the process looks easy enough - we just need to download the data, and then push them to the receiver. Sadly, the AssistNow documentat

gebi

#!/usr/bin/perl
#
# Brad's el-ghetto do-our-storage-stacks-lie?-script
#

sub usage {
    die <<'END';
Usage: diskchecker.pl -s <server[:port]> verify <file>
       diskchecker.pl -s <server[:port]> create <file> <size_in_MB>
       diskchecker.pl -l [port]

gebi

# long running queries:
SELECT
  pid,
  now() - pg_stat_activity.query_start AS duration,
  query,
  state
FROM pg_stat_activity
WHERE (now() - pg_stat_activity.query_start) > interval '5 minutes';

## active queries and killing them:

gebi

>++++++++[<++++++++>-]<-->
>++++++[<+++++++>-]<+>
,[[-<.>]<+++.---<.>>,]

gebi

[alias]
a  = annex
sf = svn fetch
sr = svn rebase
sd = svn dcommit
s  = status
st = status
sb = show-branch
b  = branch
c  = clone

gebi

#!/bin/bash

tmp_=$(mktemp -d --tmpdir google-chrome-anon-XXXXXXXXXX)
echo "private dir: " $tmp_
trap "{ rm -rf /tmp/$(basename $tmp_); exit 255; }" EXIT

nice -n5 google-chrome --user-data-dir=$tmp_

gebi

package main

import (
    "encoding/json"
    "io/ioutil"
    "log"
    "net/http"
    "strconv"
)

gebi

package main

import (
    "encoding/csv"
    "flag"
    "fmt"
    "io"
    "os"
)

gebi

#include <unistd.h>

static char staticfoo[80*1024*1024]; // = {"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"};

#define WRITE(Str) write(1, Str, sizeof(Str))

int main()
{   
    char in;
    int i;

gebi

package main

import (
    "os"
    "fmt"
    "log"
    "strconv"
    "github.com/cznic/mathutil"
)