Table showing results for each question in the survey

Item	N	Categories	Frequency/descriptive stats	Percentage
Gender	`N=872	Male	844	96.8
		Female	28	3.2
Age	N=712	Mean	46.1	n/a
		Median	45	n/a
		Mode	35	n/a
		SD	38.4	n/a
Years holding driving licence	N=712	Mean	26	n/a
		Median	25	n/a
		Mode	20	n/a
		SD	13.2	n/a
Miles driven per year	N=712	Mean	18	n/a
		Median	15	n/a
		Mode	12	n/a
		SD	15.9	n/a
KM driven per year	N=712	Mean	29	n/a
		Median	24	n/a
		Mode	19	n/a
		SD	25.5	n/a
Miles driven past 5 years	N=712	Mean	88.3	n/a
		Median	70	n/a
		Mode	100	n/a
		SD	70.9	n/a
KM driven past 5 years	N=712	Mean	142	n/a
		Median	112	n/a
		Mode	160	n/a
		SD	114	n/a

Driving experience level	N=712	Inexperienced novice	1	0.1
		Experienced novice	4	0.6
		Inexperienced driver	65	9.1
		Experienced driver	250	35
		Very experienced driver	395	55.2
Employment	`N=872	Self-employed	140	16.1
		Employed (manager)	207	23.7
		Employed	370	42.4
		Retired	120	13.8
		Student	16	1.8
		Other	19	2.2
Computer Skill	`N=872	Expert	307	35.2
		Considerable skills	378	43.3
		Moderate skills	158	18.1
		Some skills	22	2.5
		Insignificant skills	6	0.7
		No skills	1	0.1
Nav_type	`N=872	Integrated	123	14.1
		Separate	453	51.9
		PDA	260	29.8
		Mobile phone	16	1.8
		Handmade	11	1.3
		Other	9	1
1st_nav?	`N=872	Yes	504	57.8
		No	368	42.2

Months using nav ?	N=712	Mean	20	n/a
		Median	12	n/a
		Mode	24	n/a
		SD	38.6	n/a
Months using current map	N=712	Mean	11.3	n/a
		Median	6	n/a
		Mode	12	n/a
		SD	35.3	n/a
Purchased map update?	`N=872	Yes	374	42.9
		No	498	57.1
Map update frequency	N=467	More than once a year	73	15.6
		Once a year	212	45.4
		Once every 2 years	116	24.8
		Once every 3 years or more	66	14.1
Why did you update the map ?	N=441	Due to holiday or trip/change of address	82	18.6
		Due to manufacturer advice	85	19.3
		Due to advice from other sources	46	10.4
		Due to awareness of roadworks road changes	115	26.1
		System previously gave inaccurate instructions	91	20.6
		It was a gift	9	2
		Other	44	10
		It was free/warranty/part of software or hardware updgrade	39	8.9
		Good sense to update a map/like to keep up to date when available	36	8.2
		Extra features with new maps (e.g. TMC)	9	2
		Beta test/produce maps	11	2.5
Cost of updating	N=487	Reasonable	142	29.2
		Expensive	237	48.7
		Very expensive	108	22.2
Is it important to update map ?	N=510	Yes	400	45.9
		No	70	8
		Not sure	40	4.6
Why didn’t you update the map ?	N=550	Its too expensive	145	26.4
		I bought system too recently/bought new system	218	39.6
		Wasn’t aware they needed updating	16	2.9
		Don’t use my system often enough	50	9
		Don’t need to/Don’t need to yet	78	14.2
		Don’t know how to/Don’t know how often updates available	8	1.5
		Other	56	10.2
		Awaiting maps/waiting for offer	2	0.4
		No map updates available	33	6
		Don’t know if my area is covered by update	1	0.2
		Area I travel in not been updated/not enough changes to justify	5	0.9
		Loss of current software features	4	0.8
		Forget to update	2	0.4
Would you update map in future ?	N=679	Yes	569	83.8
		No	32	4.7
		Not sure	78	11.5
Passive usage_familiar areas	N=872	Never	132	15.1
		Hardly ever	163	18.7
		Occasionally	232	26.6
		Quite often	127	14.6
		Frequently	117	13.4
		Nearly all the time	101	11.6
Passive_usage_unfamiliar areas	N=872	Never	121	13.9
		Hardly ever	157	18
		Occasionally	163	18.7
		Quite often	125	14.3
		Frequently	122	14
		Nearly all the time	184	21.1

Active_usage_familiar areas	N=872	Never	130	14.9
		Hardly ever	238	27.3
		Occasionally	312	35.8
		Quite often	103	11.8
		Frequently	53	6.1
		Nearly all the time	36	4.1
Active_usage_unfamiliar areas	N=872	Never	3	0.3
		Hardly ever	6	0.7
		Occasionally	33	3.8
		Quite often	84	9.6
		Frequently	251	28.8
		Nearly all the time	495	56.8
Preferred source of RG info	N=872	Display only	53	6.1
		Mainly display	130	14.9
		Both of equal importance	616	70.6
		Mainly voice	71	8.1
		Voice only	2	0.2
Correspondence between system and own RG	N=872	Very low correspondence	34	3.9
		Low correspondence	91	10.4
		Moderate correspondence	468	53.7
		High correspondence	261	29.9
		Very high correspondence	18	2.1
Do you ever enter destinations while driving ?	N=872	Never	224	25.7
		Hardly ever	230	26.4
		Occasionally	260	29.9
		Quite often	113	13
		Frequently	45	5.2

Which dest_entry features should be allowed while driving?	N=872	Enter destination by address	231	26.5
		Enter destination by postcode	239	27.4
		Enter destination by POI	301	34.5
		Enter destination by previously stored destination	526	60.3
		None of these	290	33.3
Which nav_functions should be allowed while driving ?	N=872	Change volume	658	75.5
		Manipulate map	311	35.7
		Change preferences	200	22.9
		Browse POIs	176	20.2
		Change view	518	59.4
		None of these	146	16.7
How often do you now travel in unfamiliar areas ?	N=872	Much less frequently than before	14	1.6
		Less frequently than before	36	4.1
		About as frequently than before	586	67.2
		More frequently than before	167	19.2
		Much more frequently than before	169	7.9
Has NS affected attention to traffic and roadsigns ?	N=872	Decreased	29	3.3
		Slightly decreased	126	14.4
		No effect	282	32.3
		Slightly increased	189	21.7
		Increased	246	28.2
Has time to learn routes increased or decreased ?	N=872	Decreased	93	10.7
		Slightly decreased	181	20.8
		No effect	438	50.2
		Slightly increased	116	13.3
		Increased	44	5
Do you think RG is always completely reliable ?	N=872	Yes	128	14.7
		No	744	85.3
Has system every given inefficient/wrong RG instructions ?	N=780	Yes	715	91.7
		No	38	4.9
		Not sure	27	3.5
Has system ever given dangerous/illegal RG instructions ?	N=778	Yes	326	41.9
		No	452	58.1
What dangerous/illegal instructions were given ?	N=348	Turn into a street signposted as no-entry/no permitted turning	191	54.9
		Perform prohibited manoeuvres	149	42.8
		Drive the wrong way down a one-way street	138	39.7
		Driver is bus lanes/streets vehicle is not allowed or unsuitable/train tracks	42	12.1
		Drive through fjords, woodland/rural areas cars not allowed	70	20.1
		Drive through pedestrianised zones/city areas cars not allowed	59	17
		Other	39	11.2
		Drive onto cycle tracks	1	0.3
		No road or turn exists/map is wrong	7	2
Have you ever followed this advice ?	N=411	Yes	74	18
		No	337	82
Have you ever been delivered to the wrong final destination ?	N=872	Yes	250	28.7
		No	622	71.3
Has it happened more than once ?	N=363	Yes	151	41.6
		No	212	58.4
Whose fault was it ?	N=280	My fault	53	18.9
		System fault	161	57.5
		Both	66	23.6

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